Contract

Exhibit 4.1 TRANSDIGM INC., TRANSDIGM GROUP INCORPORATED, THE GUARANTORS named herein, THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., as Trustee and US Collateral Agent and THE BANK OF NEW YORK MELLON, as UK Collateral Agent INDENTURE Dated as of April 8, 2020 8.00% Senior Secured Notes due 2025

Table of Contents Page ARTICLE I DEFINITIONS AND INCORPORATION BY REFERENCE SECTION 1.01. Definitions ........................................................................................................1 SECTION 1.02. Other Definitions ............................................................................................34 SECTION 1.03. Concerning the Trust Indenture Act ...............................................................35 SECTION 1.04. Rules of Construction .....................................................................................35 ARTICLE II THE NOTES SECTION 2.01. Form and Dating .............................................................................................36 SECTION 2.02. Execution and Authentication ........................................................................36 SECTION 2.03. Registrar and Paying Agent ............................................................................37 SECTION 2.04. Paying Agent to Hold Money in Trust ...........................................................38 SECTION 2.05. Holder Lists ....................................................................................................38 SECTION 2.06. Transfer and Exchange ...................................................................................38 SECTION 2.07. Replacement Notes .........................................................................................40 SECTION 2.08. Outstanding Notes ..........................................................................................40 SECTION 2.09. Treasury Notes ...............................................................................................40 SECTION 2.10. Temporary Notes ............................................................................................41 SECTION 2.11. Cancellation ....................................................................................................41 SECTION 2.12. Defaulted Interest ...........................................................................................41 SECTION 2.13. CUSIP or ISIN Numbers ................................................................................41 SECTION 2.14. Issuance of Additional Notes .........................................................................42 ARTICLE III REDEMPTION AND PREPAYMENT SECTION 3.01. Notices to Trustee ...........................................................................................42 SECTION 3.02. Selection of Notes to Be Redeemed ...............................................................42 SECTION 3.03. Notice of Redemption ....................................................................................43 SECTION 3.04. Effect of Notice of Redemption .....................................................................43 SECTION 3.05. Deposit of Redemption Price .........................................................................44 SECTION 3.06. Notes Redeemed in Part .................................................................................44 SECTION 3.07. Optional Redemption .....................................................................................44 SECTION 3.08. No Mandatory Redemption; Open Market Purchases ....................................45 SECTION 3.09. Offer to Purchase by Application of Net Proceeds Offer Amount .................45

APPENDIX AND EXHIBITS RULE 144A/REGULATION S APPENDIX Exhibit A FORM OF NOTE v

INDENTURE dated as of April 8, 2020, among TransDigm Inc., a Delaware corporation (the “Company”), TransDigm Group Incorporated, a Delaware corporation (“Holdings”), the Guarantors (as herein defined), The Bank of New York Mellon Trust Company, N.A., a national banking association, as trustee (the “Trustee”) and a notes collateral agent (the “US Collateral Agent”), and The Bank of New York Mellon, as a notes collateral agent (the “UK Collateral Agent”; each of the US Collateral Agent and the UK Collateral Agent, individually, a “Notes Collateral Agent” and, collectively, the “Notes Collateral Agents”). The Company, Holdings, the Guarantors and the Trustee agree as follows for the benefit of each other and for the equal and ratable benefit of the Holders (as herein defined): ARTICLE I DEFINITIONS AND INCORPORATION BY REFERENCE SECTION 1.01. Definitions. “2010 Transactions” means the closing of the Acquisition, the offering of the 2018 Notes on December 14, 2010, the borrowings made on December 14, 2010 pursuant to the Credit Facilities and the repayment of certain Indebtedness of the Company and Holdings with the proceeds of such borrowings and issuance of the 2018 Notes. “2014 Transactions” means the offering of the 2022 Notes and the 2024 Notes on June 4, 2014, the borrowings made on June 4, 2014 pursuant to the Credit Facilities and the repayment of the 2018 Notes with the proceeds of such offerings and borrowings. “2015 Transactions” means the offering of the 2025 Notes on May 14, 2015 and the borrowings by the Company of up to $1,040,000,000 of term loans due 2022 pursuant to the Credit Facilities. “2016 Transactions” means the offering of the 2026 Notes on June 9, 2016 and the borrowings by the Company of up to $500,000,000 of term loans due 2023 pursuant to the Credit Facilities. “2018 Notes” means the Company’s 7.75% Senior Subordinated Notes due 2018 issued under the Indenture dated December 14, 2010 among the Company, Holdings, the subsidiary guarantors from time to time party thereto and The Bank of New York Mellon Trust Company, N.A., as Trustee. “2018 Transactions” means the offering of the UK Notes on May 8, 2018 and the borrowings by the Company of up to $700,000,000 of tranche E term loans due 2023 pursuant to the Credit Facilities. “2019 Transactions” means the offering of the 2027 5.50% Notes on November 13, 2019 and the redemption of the 2022 Notes with the proceeds of such offering. 1

“2020 Notes” means the Company’s 5.500% Senior Subordinated Notes due 2020 issued under the Indenture dated October 15, 2012, among the Company, Holdings, the subsidiary guarantors from time to time party thereto and The Bank of New York Mellon Trust Company, N.A., as Trustee. “2022 Notes” means the Company’s 6.000% Senior Subordinated Notes due 2022 issued under the Indenture dated June 4, 2014, among the Company, Holdings, the subsidiary guarantors from time to time party thereto and The Bank of New York Mellon Trust Company, N.A., as Trustee. “2024 Notes” means the Company’s 6.500% Senior Subordinated Notes due 2024 issued under the Indenture dated June 4, 2014, among the Company, Holdings, the subsidiary guarantors from time to time party thereto and The Bank of New York Mellon Trust Company, N.A., as Trustee. “2025 Notes” means the Company’s 6.500% Senior Subordinated Notes due 2025 issued under the Indenture dated May 14, 2015, among the Company, Holdings, the subsidiary guarantors from time to time party thereto and The Bank of New York Mellon Trust Company, N.A., as Trustee. “2026 Notes” means the Company’s 6.375% Senior Subordinated Notes due 2026 issued under the Indenture dated June 9, 2016, among the Company, Holdings, the subsidiary guarantors from time to time party thereto and The Bank of New York Mellon Trust Company, N.A., as Trustee. “2026 Secured Notes” means the Company’s 6.25% Senior Secured Notes due 2026 issued under the Indenture dated February 13, 2019, among the Company, Holdings, the subsidiary guarantors from time to time party thereto, the 2026 Secured Notes Trustee and the 2026 Secured Notes Collateral Agents. “2026 Secured Notes Collateral Agents” means The Bank of New York Mellon Trust Company, N.A., in its capacity as US collateral agent under the 2026 Secured Notes Indenture, and The Bank of New York Mellon, in its capacity as UK collateral agent under the 2026 Secured Notes Indenture. “2026 Secured Notes Indenture” means the Indenture dated February 13, 2019, among the Company, Holdings, the subsidiary guarantors from time to time party thereto, the 2026 Secured Notes Trustee and the 2026 Secured Notes Collateral Agents, governing the 2026 Secured Notes. “2026 Secured Notes Indenture Secured Parties” has the meaning assigned to the term “Indenture Secured Parties” in the 2026 Secured Notes Indenture. “2026 Secured Notes Obligations” means all Obligations with respect to the 2026 Secured Notes pursuant to the 2026 Secured Notes, the 2026 Secured Notes Indenture, the Intercreditor Agreement and the security documents relating to the 2026 Secured Notes. 2

“2026 Secured Notes Trustee” means The Bank of New York Mellon Trust Company, N.A., as Trustee under the 2026 Secured Notes, or any successor thereto in such capacity, and any successor or other trustee (and their respective successors) under the 2026 Secured Notes Indenture. “2026 Secured Notes Security Documents” has the meaning assigned to the term “Security Documents” in the 2026 Secured Notes Indenture. “2027 5.50% Notes” means the Company’s 5.50% Senior Subordinated Notes due 2027 issued under the Indenture dated November 13, 2019, among the Company, Holdings, the subsidiary guarantors from time to time party thereto and The Bank of New York Mellon Trust Company, N.A., as Trustee. “2027 7.50% Notes” means the Company’s 7.50% Senior Subordinated Notes due 2027 issued under the Indenture dated February 13, 2019, among the Company, Holdings, the subsidiary guarantors from time to time party thereto and The Bank of New York Mellon Trust Company, N.A., as Trustee. “A/R Facility” means the Company’s 364-day, $350 million revolving accounts receivable securitization facility, entered into on October 21, 2013, as further described in the Final Offering Memorandum. “Acquired Indebtedness” means Indebtedness of a Person or any of its Subsidiaries existing at the time such Person becomes a Restricted Subsidiary of the Company or at the time it merges or consolidates with or into the Company or any of its Subsidiaries or that is assumed in connection with the acquisition of assets from such Person, including Indebtedness incurred by such Person in connection with, or in anticipation or contemplation of, such Person becoming a Restricted Subsidiary of the Company or such acquisition, merger or consolidation. “Acquisition” means the acquisition of all the equity interests of XxXxxxxxx Aerospace Holdings, Inc., a Delaware corporation, from XxXxxxxxx Holdings LLC, pursuant to a Stock Purchase Agreement, dated as of September 25, 2010, by and among XxXxxxxxx Holdings LLC, the Company and Holdings. “Additional Notes” means, subject to the Company’s compliance with Section 4.03 and Section 4.12, 8.00% Senior Secured Notes due 2025 issued from time to time after the Issue Date under the terms of this Indenture (other than pursuant to Section 2.06, 2.07, 2.09 or 3.06 of this Indenture). “Adjusted Treasury Rate” means, with respect to any redemption date, as provided by the Company, (1) the yield, under the heading which represents the average for the immediately preceding week, appearing in the most recently published statistical release designated “H. 15(519)” or any successor publication which is published weekly by the Board of Governors of the Federal Reserve System and which establishes yields on actively traded United States Treasury securities adjusted to constant maturity under the caption “Treasury Constant Maturities,” for the maturity corresponding to the Comparable Treasury Issue (if no maturity is within three months before or after the Initial Redemption Date, yields for the two published maturities most closely corresponding to the Comparable Treasury Issue shall be determined and 3

the Adjusted Treasury Rate shall be interpolated or extrapolated from such yields on a straight line basis, rounding to the nearest month) or (2) if such release (or any successor release) is not published during the week preceding the calculation date or does not contain such yields, the rate per year equal to the semi-annual equivalent yield to maturity of the Comparable Treasury Issue (expressed as a percentage of its principal amount) equal to the Comparable Treasury Price for such redemption date, in each case calculated on the third Business Day immediately preceding the date that the applicable redemption notice is first sent or mailed, in each case, plus 0.50%. “Affiliate” means, with respect to any specified Person, any other Person who directly or indirectly through one or more intermediaries controls, or is controlled by, or is under common control with, such specified Person. The term “control” means the possession, directly or indirectly, of the power to direct or cause the direction of the management and policies of a Person, whether through the ownership of voting securities, by contract or otherwise; and the terms “controlling” and “controlled” have meanings correlative of the foregoing. Notwithstanding the foregoing, no Person (other than the Company or any Subsidiary of the Company) in whom a Securitization Entity makes an Investment in connection with a Qualified Securitization Transaction shall be deemed to be an Affiliate of the Company or any of its Subsidiaries solely by reason of such Investment. “Applicable Premium” means, with respect to a Note at any redemption date, as provided by the Company, the greater of (1) 1.00% of the principal amount of such Note and (2) the excess of (A) the present value at such redemption date of (i) the redemption price of such Note on the Initial Redemption Date (such redemption price exclusive of any accrued and unpaid interest) plus (ii) all required remaining scheduled interest payments due on such Note through the Initial Redemption Date (but excluding accrued and unpaid interest, if any, to the redemption date), computed using a discount rate equal to the Adjusted Treasury Rate, over (B) the principal amount of such Note on such redemption date. “Asset Acquisition” means (a) an Investment by the Company or any Restricted Subsidiary of the Company in any other Person pursuant to which such Person shall become a Restricted Subsidiary of the Company, or shall be merged with or into the Company or any Restricted Subsidiary of the Company or (b) the acquisition by the Company or any Restricted Subsidiary of the Company of the assets of any Person (other than a Restricted Subsidiary of the Company) other than in the ordinary course of business. “Asset Sale” means any direct or indirect sale, issuance, conveyance, transfer, lease (other than operating leases entered into in the ordinary course of business), assignment or other transfer for value by the Company or any of its Restricted Subsidiaries (including any Sale and Leaseback Transaction) to any Person other than the Company or a Restricted Subsidiary of the Company of: (a) any Capital Stock of any Restricted Subsidiary of the Company or (b) any other property or assets of the Company or any Restricted Subsidiary of the Company other than in the ordinary course of business; provided, however, that Asset Sales or other dispositions shall not include (i) a transaction or series of related transactions for which the Company or its Restricted Subsidiaries receive aggregate consideration of less than $25.0 million, (ii) the sale, lease, conveyance, disposition or other transfer of all or substantially all of the assets of the Company as permitted by Section 5.01 hereof or any disposition that constitutes a Change of Control, (iii) the sale or discount, in each case without recourse, of accounts receivable arising in 4

the ordinary course of business, but only in connection with the compromise or collection thereof, (iv) disposals or replacements of obsolete equipment in the ordinary course of business, (v) the sale, lease, conveyance, disposition or other transfer by the Company or any Restricted Subsidiary of assets or property to one or more Restricted Subsidiaries in connection with Investments permitted by Section 4.07 hereof or pursuant to any Permitted Investment, (vi) sales of accounts receivable, equipment and related assets (including contract rights) of the type specified in the definition of “Qualified Securitization Transaction” to a Securitization Entity for the fair market value thereof, including cash in an amount at least equal to 75% of the fair market value thereof as determined in accordance with GAAP (for the purposes of this clause (vi), Purchase Money Notes shall be deemed to be cash), (vii) dispositions of cash or Cash Equivalents, (viii) the creation of a Lien (but not the sale or other disposition of the property subject to such Lien), (ix) the sale, lease, conveyance, disposition, or other transfer of any Equity Interest of an Unrestricted Subsidiary and (x) the sale, lease, conveyance, disposition or other transfer of any asset acquired in connection with a Permitted Investment identified in an Officers’ Certificate delivered to the Trustee at the time of such Permitted Investment or promptly thereafter as “Specified Assets”; provided that the Company will not so identify any such assets unless, at the time thereof, the Company, in its reasonable business judgment, intends to dispose of, or is contemplating the disposition of, such assets following such Permitted Investment; provided further that such sale, lease, conveyance, disposition or other transfer shall have been consummated within 545 days from the date of such Permitted Investment. “Bank Indebtedness” means all Obligations pursuant to the Credit Facilities. “Bankruptcy Law” means Title 11, U.S. Code or any similar Federal or state law for the relief of debtors. “Board of Directors” means (i) with respect to a corporation, the board of directors of the corporation, (ii) with respect to a partnership, the board of directors of the general partner of the partnership, and (iii) with respect to any other Person, the board or committee of such Person serving a similar function. “Board Resolution” means, with respect to any Person, a copy of a resolution certified by the Secretary or an Assistant Secretary of such Person to have been duly adopted by the Board of Directors of such Person and to be in full force and effect on the date of such certification. “Business Day” means any day other than a Legal Holiday. “Capital Stock” means: (i) with respect to any Person that is a corporation, any and all shares, interests, participations or other equivalents (however designated and whether or not voting) of corporate stock, including each class of Common Stock and Preferred Stock, of such Person and (ii) with respect to any Person that is not a corporation, any and all partnership or other equity interests of such Person. “Capitalized Lease Obligations” means, as to any Person, the obligations of such Person under a lease that are required to be classified and accounted for as capital lease obligations under GAAP and, for purposes of this definition, the amount of such obligations at 5

any date shall be the capitalized amount of such obligations at such date, determined in accordance with GAAP. “Cash Equivalents” means (i) marketable direct obligations issued by, or unconditionally guaranteed by, the United States Government or issued by any agency thereof and backed by the full faith and credit of the United States of America, in each case maturing within one year from the date of acquisition thereof; (ii) marketable direct obligations issued by any state of the United States of America or any political subdivision of any such state or any public instrumentality thereof maturing within one year from the date of acquisition thereof and, at the time of acquisition, having one of the three highest ratings obtainable from either S&P or Xxxxx’x; (iii) commercial paper maturing no more than one year from the date of creation thereof and, at the time of acquisition, having a rating of at least A-1 from S&P or at least P-1 from Xxxxx’x; (iv) certificates of deposit or bankers’ acceptances maturing within one year from the date of acquisition thereof issued by any bank organized under the laws of the United States of America or any state thereof or the District of Columbia or any U.S. branch of a foreign bank or by a bank organized under the laws of any foreign country recognized by the United States of America, in each case having at the date of acquisition thereof combined capital and surplus of not less than $250.0 million (or the foreign currency equivalent thereof); (v) repurchase obligations with a term of not more than seven days for underlying securities of the types described in clause (i) above entered into with any bank meeting the qualifications specified in clause (iv) above; and (vi) investments in money market funds which invest substantially all their assets in securities of the types described in clauses (i) through (v) above. “Change of Control” means the occurrence of one or more of the following events: (i) any sale, lease, exchange or other transfer (in one transaction or a series of related transactions) of all or substantially all of the assets of the Company or Holdings to any Person or group of related Persons for purposes of Section 13(d) of the Exchange Act (a “Group”) other than to the Company (in the case of the assets of Holdings); (ii) the approval by the holders of Capital Stock of the Company of any plan or proposal for the liquidation or dissolution of the Company (whether or not otherwise in compliance with the provisions of this Indenture); or (iii) any Person or Group shall become the beneficial owner, directly or indirectly, of shares representing more than 50% of the total ordinary voting power represented by the issued and outstanding Capital Stock of the Company or Holdings. “Collateral” means (i) all assets and properties subject to Liens created pursuant to any Security Documents to secure the Notes Obligations (including the Guarantees), the Security Documents and this Indenture and (ii) any real property owned by a Grantor that secures Senior Secured Debt; provided, however, that no Excluded Collateral (as defined in the Security Agreement) shall constitute Collateral. “Common Stock” of any Person means any and all shares, interests or other participations in, and other equivalents (however designated and whether voting or non-voting) of such Person’s common stock, whether outstanding on the Issue Date or issued after the Issue Date, and includes all series and classes of such common stock. “Company” means the party named as such in this Indenture until a successor replaces it and, thereafter, means the successor. 6

“Comparable Treasury Issue” means the United States Treasury security selected by the Quotation Agent as having a maturity comparable to the remaining term of the Notes from the redemption date to the Initial Redemption Date, that would be utilized, at the time of selection and in accordance with customary financial practice, in pricing new issues of corporate debt securities of a maturity most nearly equal to the Initial Redemption Date. “Comparable Treasury Price” means, with respect to any redemption date, if clause (2) of the Adjusted Treasury Rate definition is applicable, the average of three, or such lesser number as is obtained by the Company, Reference Treasury Dealer Quotations for such redemption date. “Consolidated EBITDA” means, with respect to any Person, for any period, the sum (without duplication) of such Person’s (i) Consolidated Net Income; and (ii) to the extent Consolidated Net Income has been reduced thereby: (A) (i) all income taxes and foreign withholding taxes, (ii) all taxes based on capital and commercial activity (or similar taxes), and (iii) any taxes that result from (x) the exercise by any holder of warrants, options or other rights to acquire Qualified Capital Stock (other than Qualified Capital Stock that is Preferred Stock) or (y) Dividend Equivalent Payments, in each case, of such Person and its Restricted Subsidiaries paid or accrued in accordance with GAAP for such period; (B) Consolidated Interest Expense; (C) Consolidated Non-cash Charges less any non-cash items increasing Consolidated Net Income for such period (other than normal accruals in the ordinary course of business), all as determined on a consolidated basis for such Person and its Restricted Subsidiaries in accordance with GAAP; (D) any extraordinary, unusual or nonrecurring gain, loss or charge (including fees, expenses and charges (or any amortization thereof) associated with any acquisition, merger or consolidation, in each case, whether or not completed), any severance, relocation, consolidation, closing, integration, facilities opening, business optimization, transition or restructuring costs, charges or expenses (including any costs or expenses associated with any expatriate), any signing, retention or completion bonuses, and any costs associated with curtailments or modifications to pension and postretirement employee benefit plans; (E) any expenses or charges related to any Equity Offering, Permitted Investment, acquisition, disposition, recapitalization or the incurrence of Indebtedness permitted to be incurred by this Indenture, including a refinancing thereof (whether or not successful) and any amendment or modification to the terms of any such transactions, including such fees, expenses or charges related to the 2010 Transactions, the 2014 Transactions, the 2015 Transactions, the 2016 Transactions, the 2018 Transactions, the 2019 Transactions, the Esterline Transactions or the Transaction; (F) any write-offs, write-downs or other non-cash charges, excluding any such charge that represents an accrual or reserve for a cash expenditure for a future period and the write-off or write-down of current assets; (G) the amount of any expense related to, or loss attributable to, minority interests or investments; (H) any expenses related to, or attributed to, non-service related pensions; (I) the amount of any earn-out payments or deferred purchase price in conjunction with acquisitions; (J) any costs or expenses incurred by the Company or a Restricted Subsidiary pursuant to any management equity plan or stock option plan or any other management or employee benefit plan or agreement or any stock subscription or stockholders agreement, to the extent that such costs or expenses are funded with cash proceeds contributed to the capital of the Company or net cash proceeds of issuance of Qualified Capital Stock of the Company (other than Disqualified Capital Stock that is Preferred Stock); (K) any Dividend Equivalent Payments; (L) any costs or expenses incurred in connection with the start-up or extension of long-term arrangements with customers; and (M) the 7

amount of net cost savings projected by the Company in good faith to be realized as the result of actions to be taken within 24 months of the initiation of any operational change or within 24 months of the consummation of any applicable acquisition or cessation of operations (in each case, calculated on a pro forma basis as though such cost savings had been realized on the first day of such period), net of the amount of actual benefits realized during such period from such actions; provided that the aggregate amount of other cost savings added pursuant to this clause (M) shall not exceed 25.0% of Consolidated EBITDA for any Four-Quarter Period (calculated after giving effect to any adjustment pursuant to this clause (M)) (which adjustments may be incremental to any other pro forma adjustments made pursuant to the terms hereof); and (iii) decreased by (without duplication) non-cash gains increasing Consolidated Net Income of such Person for such period, excluding any gains that represent the reversal of any accrual of, or cash reserve for, anticipated cash charges in any prior period (other than such cash charges that have been added back to Consolidated Net Income in calculating Consolidated EBITDA in accordance with this definition). “Consolidated Fixed Charge Coverage Ratio” means, with respect to any Person, the ratio of Consolidated EBITDA of such Person during the four full fiscal quarters (the “Four-Quarter Period”) ending prior to the date of the transaction giving rise to the need to calculate the Consolidated Fixed Charge Coverage Ratio for which internal financial statements are available (the “Transaction Date”) to Consolidated Fixed Charges of such Person for the Four-Quarter Period. In addition to, and without limitation of, the foregoing, for purposes of this definition, “Consolidated EBITDA” and “Consolidated Fixed Charges” shall be calculated after giving effect on a pro forma basis for the period of such calculation to (i) the incurrence or repayment of any Indebtedness or the issuance of any Designated Preferred Stock of such Person or any of its Restricted Subsidiaries (and the application of the proceeds thereof) giving rise to the need to make such calculation and any incurrence or repayment of other Indebtedness or the issuance or redemption of other Preferred Stock (and the application of the proceeds thereof), other than the incurrence or repayment of Indebtedness in the ordinary course of business for working capital purposes pursuant to revolving credit facilities, occurring during the Four-Quarter Period or at any time subsequent to the last day of the Four-Quarter Period and on or prior to the Transaction Date, as if such incurrence or repayment or issuance or redemption, as the case may be (and the application of the proceeds thereof), had occurred on the first day of the Four-Quarter Period; and (ii) any Asset Sales or other dispositions or Asset Acquisitions (including any Asset Acquisition giving rise to the need to make such calculation as a result of such Person or one of its Restricted Subsidiaries (including any Person who becomes a Restricted Subsidiary as a result of the Asset Acquisition) incurring, assuming or otherwise being liable for Acquired Indebtedness and also including any Consolidated EBITDA attributable to the assets which are the subject of the Asset Acquisition or Asset Sale or other disposition and without regard to clause (vi) of the definition of Consolidated Net Income), investments, mergers, consolidations and disposed operations (as determined in accordance with GAAP) occurring during the Four-Quarter Period or at any time subsequent to the last day of the Four-Quarter Period and on or prior to the Transaction Date, as if such Asset Sale or other disposition or Asset Acquisition (including the incurrence or assumption of any such Acquired Indebtedness), investment, merger, consolidation or disposed operation, occurred on the first day of the Four-Quarter Period. If such Person or any of its Restricted Subsidiaries directly or indirectly guarantees Indebtedness of a third Person, the preceding sentence shall give effect to the incurrence of such guaranteed Indebtedness as if such Person or any Restricted Subsidiary of 8

such Person had directly incurred or otherwise assumed such other Indebtedness that was so guaranteed. Furthermore, in calculating “Consolidated Fixed Charges” for purposes of determining the denominator (but not the numerator) of this “Consolidated Fixed Charge Coverage Ratio”: (i) interest on outstanding Indebtedness determined on a fluctuating basis as of the Transaction Date and which will continue to be so determined thereafter shall be deemed to have accrued at a fixed rate per annum equal to the rate of interest on such Indebtedness in effect on the Transaction Date; and (ii) notwithstanding clause (i) of this paragraph, interest on Indebtedness determined on a fluctuating basis, to the extent such interest is covered by agreements relating to Interest Swap Obligations, shall be deemed to accrue at the rate per annum resulting after giving effect to the operation of such agreements. For purposes of this definition, whenever pro forma effect is to be given to an acquisition of assets, the amount of income or earnings relating thereto and the amount of Consolidated Interest Expense associated with any Indebtedness incurred in connection therewith, the pro forma calculations shall be determined in good faith by a responsible financial or accounting officer of the Company. In addition, any such pro forma calculation may include adjustments appropriate, in the reasonable determination of the Company, to reflect operating expense reductions reasonably expected to result from any acquisition or merger. “Consolidated Fixed Charges” means, with respect to any Person for any period, the sum of, without duplication: (i) Consolidated Interest Expense; plus (ii) the product of (x) the amount of all cash dividend payments on any series of Preferred Stock of such Person times (y) a fraction, the numerator of which is one and the denominator of which is one minus the then-current effective consolidated Federal, state and local income tax rate of such Person, expressed as a decimal (as estimated in good faith by the chief financial officer of the Company, which estimate shall be conclusive); plus (iii) the product of (x) the amount of all dividend payments on any series of Permitted Subsidiary Preferred Stock times (y) a fraction, the numerator of which is one and the denominator of which is one minus the then-current effective consolidated Federal, state and local income tax rate of such Person, expressed as a decimal (as estimated in good faith by the chief financial officer of the Company, which estimate shall be conclusive); provided that, with respect to any series of Preferred Stock that did not pay cash dividends during such period but that is eligible to pay dividends during any period prior to the maturity date of the Notes, cash dividends shall be deemed to have been paid with respect to such series of Preferred Stock during such period for purposes of this clause (iii). “Consolidated Interest Expense” means, with respect to any Person for any period, the sum of, without duplication: (1) the aggregate of all cash and non-cash interest expense (net of interest income) with respect to all outstanding Indebtedness of such Person and its Restricted Subsidiaries, including the net costs associated with Interest Swap Obligations, for such period determined on a consolidated basis in conformity with GAAP, but excluding (i) amortization or write-off of debt issuance costs, deferred financing fees, commissions, fees and expenses, (ii) any expensing of bridge, commitment and other financing fees, (iii) commissions, discounts, yield and other fees and charges (including any interest expense) related to any Qualified Securitization Transaction; and (iv) any prepayment fee or premium paid in connection with the refinancing or repayment of any Indebtedness; (2) the consolidated 9

interest expense of such Person and its Restricted Subsidiaries that was capitalized during such period; and (3) the interest component of Capitalized Lease Obligations paid, accrued and/or scheduled to be paid or accrued by such Person and its Restricted Subsidiaries during such period as determined on a consolidated basis in accordance with GAAP. “Consolidated Net Income” means, for any period, the aggregate net income (or loss) of the Company and its Restricted Subsidiaries for such period on a consolidated basis, determined in accordance with GAAP and without any deduction in respect of Preferred Stock dividends; provided that there shall be excluded therefrom to the extent otherwise included, without duplication: (i) gains and losses from Asset Sales (without regard to the $25.0 million limitation set forth in the definition thereof) and the related tax effects according to GAAP; (ii) gains and losses due solely to fluctuations in currency values and the related tax effects according to GAAP; (iii) all extraordinary, unusual or non-recurring charges, gains and losses (including all restructuring costs, facilities relocation costs, acquisition integration costs and fees, including cash severance payments made in connection with acquisitions, and any expense or charge related to the repurchase of Capital Stock or warrants or options to purchase Capital Stock), and the related tax effects according to GAAP; (iv) the net income (or loss) from disposed or discontinued operations or any net gains or losses on disposal of disposed or discontinued operations, and the related tax effects according to GAAP; (v) any impairment charge or asset write-off (other than the write-off or write-down of current assets), in each case pursuant to GAAP, and the amortization of intangibles arising pursuant to GAAP; (vi) the net income (or loss) of any Person acquired in a pooling of interests transaction accrued prior to the date it becomes a Restricted Subsidiary of the Company or is merged or consolidated with or into the Company or any Restricted Subsidiary of the Company; (vii) solely for the purpose of determining the amount available for Restricted Payments under clause (ii) of Section 4.07, the net income (but not loss) of any Restricted Subsidiary of the Company (other than a Guarantor) to the extent that the declaration of dividends or similar distributions by that Restricted Subsidiary of the Company of that income is not at the date of determination wholly permitted without any prior governmental approval (which has not been obtained) or, directly or indirectly, by the operation of the terms of its charter or any agreement, instrument, judgment, decree, order, statute, rule or governmental regulation applicable to that Restricted Subsidiary or its stockholders, unless such restriction with respect to the payment of dividends or similar distributions has been legally waived; provided that Consolidated Net Income of the Company will be increased by the amount of dividends or other distributions or other payments actually paid in cash (or to the extent converted into cash) to the Company or a Restricted Subsidiary thereof in respect of such period, to the extent not already included therein; (viii) the net loss of any Person, other than a Restricted Subsidiary of the Company; (ix) the net income of any Person, other than a Restricted Subsidiary of the Company, except to the extent of cash dividends or distributions paid to the Company or a Restricted Subsidiary of the Company by such Person; (x) in the case of a successor to the referent Person by consolidation or merger or as a transferee of the referent Person’s assets, any earnings of the successor corporation prior to such consolidation, merger or transfer of assets; (xi) any non-cash compensation charges and deferred compensation charges, including any arising from existing stock options resulting from any merger or recapitalization transaction; provided, however, that Consolidated Net Income for any period shall be reduced by any cash payments made during such period by such Person in connection with any such deferred compensation, whether or not such reduction is in accordance with GAAP; and (xii) inventory and backlog purchase accounting adjustments and amortization 10

and impairment charges resulting from other purchase accounting adjustments with respect to acquisition transactions. For purposes of clause (ii)(v) of Section 4.07, Consolidated Net Income shall be reduced by any cash dividends paid with respect to any series of Designated Preferred Stock. “Consolidated Non-cash Charges” means, with respect to any Person, for any period, the aggregate depreciation, amortization and other non-cash charges, impairments and expenses of such Person and its Restricted Subsidiaries reducing Consolidated Net Income of such Person and its Restricted Subsidiaries for such period, determined on a consolidated basis in accordance with GAAP (excluding any such charges that require an accrual of, or a reserve for, cash payments for any future period other than accruals or reserves associated with mandatory repurchases of equity securities). For clarification purposes, purchase accounting adjustments with respect to inventory and backlog will be included in Consolidated Non-cash Charges. “Consolidated Secured Debt” means, as at any date of determination, the Consolidated Total Indebtedness of the Company and the Restricted Subsidiaries that is secured by Liens on assets or property of Holdings, the Company and the Restricted Subsidiaries as of such date. “Consolidated Secured Net Debt Ratio” means, as of any date of determination, the ratio of (a) Consolidated Secured Debt as of such date minus Unrestricted Cash as of such date to (b) the Consolidated EBITDA of the Company and the Restricted Subsidiaries for the period of the most recently ended four full consecutive fiscal quarters for which internal financial statements are available on or immediately preceding such date. In any period of four consecutive fiscal quarters in which any Permitted Acquisition or Asset Sale occurs, the Consolidated Secured Net Debt Ratio shall be determined on a pro forma basis. “Consolidated Total Indebtedness” means, as at any date of determination, an amount equal to the sum of (a) the aggregate principal amount of all outstanding Indebtedness of the Company and the Restricted Subsidiaries on a consolidated basis consisting of Indebtedness for borrowed money, obligations in respect of Capitalized Lease Obligations, attributable debt in respect of Sale and Leaseback Transactions and debt obligations evidenced by bonds, notes, debentures or similar instruments or letters of credit or bankers’ acceptances (and excluding (i) any undrawn letters of credit issued in the ordinary course of business and (ii) Indebtedness of Securitization Entities incurred under clause (xii) of the definition of the term “Permitted Indebtedness”), (b) the aggregate amount of all outstanding Disqualified Capital Stock of the Company and all Disqualified Capital Stock and Preferred Stock of the Restricted Subsidiaries (excluding items eliminated in consolidation), with the amount of such Disqualified Capital Stock and Preferred Stock equal to the greater of their respective voluntary or involuntary liquidation preferences and Maximum Fixed Repurchase Prices, (c) guarantees and other contingent obligations of the Company and the Restricted Subsidiaries (excluding items eliminated in consolidation and only to the extent related to Indebtedness that would constitute “Consolidated Total Indebtedness” under clause (a) or (b) of this definition), with the amount of such guarantees or other contingent obligations deemed to be an amount equal to the maximum stated amount of the guarantee or contingent obligation or, if none, the stated or determinable amount of the primary Indebtedness in respect of which such guarantee or contingent obligation is made or, if there is no stated or determinable amount of the primary Indebtedness, the 11

maximum reasonably anticipated liability in respect thereof (assuming the Company or such Restricted Subsidiary, as applicable, is required to perform thereunder) as determined by the Company in good faith and (d) Indebtedness that would constitute “Consolidated Total Indebtedness” under clause (a) or (b) of this definition which are secured by any Lien on any property or asset of the Company or any of the Restricted Subsidiaries (excluding items eliminated in consolidation), with the amount of such obligation being deemed to be the lesser of the fair market value of such property or asset and the amount of the obligation so secured, in each case determined on a consolidated basis in accordance with GAAP. For purposes of this definition, the “Maximum Fixed Repurchase Price” of any Disqualified Capital Stock or Preferred Stock that does not have a fixed repurchase price shall be calculated in accordance with the terms of such Disqualified Capital Stock or Preferred Stock as if such Disqualified Capital Stock or Preferred Stock were purchased on any date on which Consolidated Total Indebtedness shall be required to be determined pursuant to this Indenture, and if such price is based upon, or measured by, the fair market value of such Disqualified Capital Stock or Preferred Stock, such fair market value shall be determined reasonably and in good faith by the Company. “Corporate Trust Office of the Trustee” shall be at the address of the Trustee specified in Section 11.01 hereof or such other address as to which the Trustee may give notice to the Company. “Credit Agreement Administrative Agent” means Credit Suisse AG, as Administrative Agent under the Credit Facilities, or any successor thereto in such capacity, and any successor or other administrative agent (and their respective successors) under any Credit Facility. “Credit Agreement Collateral Agent” means Credit Suisse AG, as Collateral Agent under the Credit Facilities, or any successor thereto in such capacity, and any successor or other collateral agent (and their respective successors) under any Credit Facility. “Credit Facilities” means the second amended and restated credit agreement dated as of June 4, 2014 among the Company, Holdings, the financial institutions party thereto as lenders thereunder, Credit Suisse AG, as administrative agent and collateral agent, and any other agent party thereto, and any amendments, supplements, modifications, extensions, replacements, renewals, restatements, refundings or refinancings thereof and any indentures or credit facilities or commercial paper facilities with banks or other institutional lenders or investors that extend, replace, refund, refinance, renew or defease any part of the loans, notes, other credit facilities or commitments thereunder or incurred as “incremental equivalent debt” or similar terms thereunder, including any such replacement, refunding or refinancing facility, or accordion or additional credit agreement, or indenture that increases the amount borrowable thereunder or alters the maturity thereof (provided that such increase in borrowings is permitted under Section 4.09). “Credit Facilities Secured Parties” means the “Secured Parties” as defined under the Credit Facilities. 12

“Currency Agreement” means any foreign exchange contract, currency swap agreement or other similar agreement or arrangement designed to protect the Company or any Restricted Subsidiary of the Company against fluctuations in currency values. “Debenture” means the Debenture, dated as of the Issue Date, among TransDigm UK Holdings plc and the UK Collateral Agent, as amended, restated, amended and restated, renewed, replaced, supplemented or otherwise modified from time to time. “Debenture Collateral” means all the assets and undertakings of TransDigm UK Holdings plc which from time to time are subject of the security interest created or expressed to be created in favour of the UK Collateral Agent by or pursuant to the Debenture. “Definitive Note” has the meaning set forth in the Appendix hereto. “Default” means an event or condition the occurrence of which is, or with the lapse of time or the giving of notice or both would be, an Event of Default. “Description of Notes” means the “Description of the Notes” section of the Final Offering Memorandum. “Designated Non-cash Consideration” means any non-cash consideration received by the Company or one of its Restricted Subsidiaries in connection with an Asset Sale that is designated as Designated Non-cash Consideration pursuant to an Officers’ Certificate executed by the principal executive officer and the principal financial officer of the Company or such Restricted Subsidiary at the time of such Asset Sale. Any particular item of Designated Non-cash Consideration will cease to be considered to be outstanding once it has been sold for cash or Cash Equivalents. “Designated Preferred Stock” means Preferred Stock that is so designated as Designated Preferred Stock, pursuant to an Officers’ Certificate executed by the principal executive officer and the principal financial officer of the Company, on the issuance date thereof, the cash proceeds of which are excluded from the calculation set forth in clause (ii)(w) of the first paragraph of Section 4.07 hereof. “Disqualified Capital Stock” means, with respect to any Person, any Capital Stock which by its terms (or by the terms of any security into which it is convertible or for which it is exchangeable at the option of the holder) or upon the happening of any event, (i) matures or is mandatorily redeemable, (other than redeemable only for Capital Stock of such Person which is not itself Disqualified Capital Stock) pursuant to a sinking fund obligation or otherwise, (ii) is convertible or exchangeable at the option of the holder for Indebtedness or Disqualified Capital Stock, or (iii) is mandatorily redeemable or must be purchased upon the occurrence of certain events or otherwise, in whole or in part; in each case on or prior to the final maturity date of the Notes; provided, however, that any Capital Stock that would not constitute Disqualified Capital Stock but for provisions thereof giving holders thereof the right to require such Person to purchase or redeem such Capital Stock upon the occurrence of an “asset sale” or “change of control” occurring prior to the final maturity date of the Notes shall not constitute Disqualified Capital Stock if: (A) the “asset sale” or “change of control” provisions applicable to such Capital Stock are not more favorable to the holders of such Capital Stock than the terms 13

applicable to the Notes and described in Sections 4.10 and 4.15 hereof, respectively; and (B) any such requirement only becomes operative after compliance with such terms applicable to the Notes, including the purchase of any Notes tendered pursuant thereto. For purposes hereof, the amount of any Disqualified Capital Stock that does not have a fixed redemption, repayment or repurchase price will be calculated in accordance with the terms of such Disqualified Capital Stock as if such Disqualified Capital Stock were redeemed, repaid or repurchased on any date on which the amount of such Disqualified Capital Stock is to be determined pursuant to the Indenture; provided, however, that if such Disqualified Capital Stock could not be required to be redeemed, repaid or repurchased at the time of such determination, the redemption, repayment or repurchase price will be the book value of such Disqualified Capital Stock as reflected in the most recent internal financial statements of such Person. “Dividend Equivalent Payment” means a payment in cash or Cash Equivalents to any director, officer or employee of Holdings or any of its Subsidiaries that is a holder of unexercised warrants, options or other rights to acquire Qualified Capital Stock (other than Qualified Capital Stock that is Preferred Stock) of Holdings, which payment represents a dividend or distribution by Holdings that such holder would have received had such holder’s warrants, options or other rights to acquire been exercised on the date of such dividend or distribution. “Domestic Restricted Subsidiary” means any direct or indirect Restricted Subsidiary of the Company that is incorporated under the laws of the United States of America, any State thereof or the District of Columbia. “Equity Offering” means any issuance of Qualified Capital Stock of Holdings or the Company; provided that, in the event such equity issuance is not in the form of a public offering registered under the Securities Act, the proceeds received by the Company directly or indirectly from such offering are not less than $10.0 million. “Esterline Acquisition” means the acquisition by the Company of Xxxxxxxxx Technologies Corporation, pursuant to the Esterline Acquisition Agreement. “Esterline Acquisition Agreement” means the agreement and plan of merger dated as of October 9, 2018, as amended, by and among Xxxxxxxxx Technologies Corporation, a Delaware corporation, the Company and Thunderbird Merger Sub Inc., a Delaware corporation and a wholly owned subsidiary of the Company. “Esterline Transactions” means the closing of the Esterline Acquisition, including the repayment of Indebtedness of Xxxxxxxxx Technologies Corporation, and the offering of the 2026 Secured Notes and the 2027 7.50% Notes on February 13, 2019, including the redemption of all outstanding 2020 Notes. “Exchange Act” means the Securities Exchange Act of 1934, as amended, or any successor statute or statutes thereto. 14

“Excluded Contribution” means net cash proceeds, Marketable Securities or Qualified Proceeds received by the Company after December 14, 2010 from (i) contributions to its common equity capital and (ii) the sale (other than to a Subsidiary of the Company or to any management equity plan or stock option plan or any other management or employee benefit plan or agreement of the Company) of Capital Stock (other than Disqualified Capital Stock and Designated Preferred Stock) of the Company, in each case designated as Excluded Contributions pursuant to an officers’ certificate executed by an executive vice president and the principal financial officer of the Company on the date such capital contributions are made or the date such Capital Stock is sold, as the case may be, which are excluded from the calculation set forth in clause (ii) of Section 4.07. “fair market value” means, with respect to any asset or property, the price which could be negotiated in an arm’s-length, free market transaction, for cash, between a willing seller and a willing and able buyer, neither of whom is under undue pressure or compulsion to complete the transaction. Fair market value shall be determined by the Board of Directors of the Company acting reasonably and in good faith. “Final Offering Memorandum” means the final version of the offering memorandum related to the offering of the Notes, dated April 2, 2020. “First Lien Obligations” means the Notes Obligations, 2026 Secured Notes Obligations, Obligations under the Credit Facilities and all other Obligations secured by Collateral on a pari passu basis with the Notes. “Foreign Restricted Subsidiary” means any Restricted Subsidiary of the Company that is not a Domestic Restricted Subsidiary, other than TransDigm UK. “Four-Quarter Period” has the meaning specified in the definition of Consolidated Fixed Charge Coverage Ratio. “GAAP” means generally accepted accounting principles set forth in the opinions and pronouncements of the Accounting Principles Board of the American Institute of Certified Public Accountants and statements and pronouncements of the Financial Accounting Standards Board or in such other statements by such other entity as may be approved by a significant segment of the accounting profession of the United States of America, as in effect as of December 14, 2010. “Government Securities” means direct obligations of, or obligations guaranteed by, the United States of America, and for the payment of which the United States pledges its full faith and credit. “Group” has the meaning specified in the definition of Change of Control. “Guarantee” means (i) the guarantee of the Notes by Holdings, TransDigm UK and the Domestic Restricted Subsidiaries of the Company in accordance with the terms of this Indenture and (ii) the guarantee of the Notes by any Restricted Subsidiary of the Company required under the terms of Section 4.17 hereof or not otherwise prohibited under this Indenture. 15

“Guarantor” means TransDigm UK and any Restricted Subsidiary of the Company that incurs a Guarantee; provided that upon the release and discharge of any such Restricted Subsidiary from its Guarantee in accordance with Section 10.07 hereof, such Restricted Subsidiary shall cease to be a Guarantor. “Grantor” means the Company, Holdings and each Guarantor. “Hedging Agreement” means any agreement with respect to the hedging of price risk associated with the purchase of commodities used in the business of the Company and its Restricted Subsidiaries, so long as any such agreement has been entered into in the ordinary course of business and not for purposes of speculation. “Holder” means a Person in whose name a Note is registered. “Holdings” means TransDigm Group Incorporated, a Delaware corporation, and its successors. “Immaterial Domestic Restricted Subsidiary” means, at any date of determination, any Domestic Restricted Subsidiary of the Company that (i) contributed 2.5% or less of Consolidated EBITDA of the Company for the period of four fiscal quarters most recently ended more than forty-five (45) days prior to the date of determination and (ii) had consolidated assets representing 2.5% or less of Total Assets on the last day of the most recent fiscal quarter ended more than forty-five (45) days prior to the date of determination. “Indebtedness” means, with respect to any Person, without duplication, (i) all Obligations of such Person for borrowed money, (ii) all Obligations of such Person evidenced by bonds, debentures, notes or other similar instruments, (iii) all Capitalized Lease Obligations of such Person, (iv) all Obligations of such Person issued or assumed as the deferred purchase price of property, all conditional sale obligations and all Obligations under any title retention agreement (but excluding trade accounts payable and other accrued liabilities arising in the ordinary course of business), (v) all Obligations for the reimbursement of any obligor on any letter of credit, banker’s acceptance or similar credit transaction, (vi) guarantees and other contingent obligations in respect of Indebtedness referred to in clauses (i) through (v) above and clause (viii) below, (vii) all Obligations of any other Person of the type referred to in clauses (i) through (vi) which are secured by any Lien on any property or asset of such Person, the amount of such Obligation being deemed to be the lesser of the fair market value of such property or asset and the amount of the Obligation so secured, (viii) all Obligations under Currency Agreements and interest swap agreements of such Person and (ix) all Disqualified Capital Stock issued by such Person with the amount of Indebtedness represented by such Disqualified Capital Stock being equal to the greater of its voluntary or involuntary liquidation preference and its maximum fixed repurchase price, but excluding accrued dividends, if any. Notwithstanding the foregoing, in connection with the purchase by the Company or any Restricted Subsidiary of the Company of any business, the term “Indebtedness” will exclude post-closing payment adjustments to which the seller may become entitled to the extent such payment is determined by a final closing balance sheet or such payment depends on the performance of such business after the closing; provided, however, that, at the time of closing, 16

the amount of any such payment is not determinable, and, to the extent such payment thereafter becomes fixed and determined, the amount is paid within 60 days thereafter. For clarification purposes, the liability of the Company or any Restricted Subsidiary of the Company to make periodic payments to licensors in consideration for the license of patents and technical information under license agreements in existence on the Issue Date and any amount payable in respect of a settlement of disputes with respect to such payments thereunder shall not constitute Indebtedness. For purposes hereof, the “maximum fixed repurchase price” of any Disqualified Capital Stock which does not have a fixed repurchase price shall be calculated in accordance with the terms of such Disqualified Capital Stock as if such Disqualified Capital Stock were purchased on any date on which Indebtedness shall be required to be determined pursuant to this Indenture, and, if such price is based upon, or measured by, the fair market value of such Disqualified Capital Stock, such fair market value shall be determined reasonably and in good faith by the Board of Directors of the issuer of such Disqualified Capital Stock. For the purposes of calculating the amount of Indebtedness of a Securitization Entity outstanding as of any date, the face or notional amount of any interest in receivables or equipment that is outstanding as of such date shall be deemed to be Indebtedness, but any such interests held by Affiliates of such Securitization Entity shall be excluded for purposes of such calculation. For the purposes hereof, the amount of any Indebtedness described in clause (viii) of the first paragraph of this definition is the net amount payable (after giving effect to permitted set off) if such Currency Agreements or interest swap agreements are terminated at that time due to a default of such Person. “Indenture” means this Indenture, as amended or supplemented from time to time. “Indenture Secured Parties” means the Holders, the Trustee and the Notes Collateral Agents. “Initial Notes” has the meaning set forth in the Appendix hereto. “Initial Redemption Date” means April 8, 2022. “Interest Swap Obligations” means the obligations of any Person pursuant to any arrangement with any other Person, whereby, directly or indirectly, such Person is entitled to receive from time to time periodic payments calculated by applying either a floating or a fixed rate of interest on a stated notional amount in exchange for periodic payments made by such other Person calculated by applying a fixed or a floating rate of interest on the same notional amount and shall include interest rate swaps, caps, floors, collars and similar agreements. “Intercreditor Agreement” means the First Lien Intercreditor Agreement, dated as of February 13, 2019 (as modified by that certain Joinder No. 1, dated as of April 8, 2020, among the Company, Holdings, the Guarantors, the Credit Agreement Collateral Agent, the 2026 Secured Notes Trustee, the 2026 Secured Notes Collateral Agent, the Trustee and the Notes Collateral Agents and as may be further amended, restated, amended and restated, renewed, replaced, supplemented or otherwise modified), among the Company, Holdings, the Guarantors, 17

the Credit Agreement Collateral Agent, the 2026 Secured Notes Trustee and the 2026 Secured Notes Collateral Agent. “Investment” means, with respect to any Person, any direct or indirect loan or other extension of credit (including a guarantee) or capital contribution to (by means of any transfer of cash or other property to others or any payment for property or services for the account or use of others), or any purchase or acquisition by such Person of any Capital Stock, bonds, notes, debentures or other securities or evidences of Indebtedness issued by, any Person. “Investment” shall exclude extensions of trade credit by the Company and its Restricted Subsidiaries in accordance with normal trade practices of the Company or such Restricted Subsidiary, as the case may be. Except as otherwise provided herein, the amount of an Investment shall be its fair market value at the time the Investment is made and without giving effect to subsequent changes in its fair market value. “Investment Grade Rating” means a rating equal to or higher than Baa3 (or the equivalent) by Moody’s and BBB– (or the equivalent) by S&P, or an equivalent rating by any other Rating Agency. “Issue Date” means April 8, 2020. “Legal Holiday” means a Saturday, a Sunday or a day on which banking institutions in the City of New York, the city in which the principal corporate trust office of the Trustee is located or at a place of payment are authorized by law, regulation or executive order to remain closed. If a payment date is a Legal Holiday at a place of payment, payment may be made at that place on the next succeeding day that is not a Legal Holiday, and no interest shall accrue on such payment for the intervening period. “Lien” means any lien, mortgage, deed of trust, pledge, security interest, charge or encumbrance of any kind (including any conditional sale or other title retention agreement, any lease in the nature thereof and any agreement to give any security interest). “Limited Condition Acquisition” means any Permitted Investment that the Company or one or more of its Subsidiaries has contractually committed to consummate, the terms of which do not condition the Company’s or its Subsidiary’s, as applicable, obligations to close such Permitted Investment on the availability of third-party financing. “Majority Holders” means the Holders of a majority in principal amount of the Notes outstanding. “Marketable Securities” means publicly traded debt or equity securities that are listed for trading on a national securities exchange and that were issued by a corporation whose debt securities are rated in one of the three highest rating categories by either S&P or Moody’s. “Moody’s” means Xxxxx’x Investors Service, Inc. or any successor thereto. “Mortgages” means any mortgage, deed of trust or other agreement which conveys or evidences a Lien in favor of a Notes Collateral Agent, for the benefit of the Indenture 18

Secured Parties, on real property of a Grantor, including any amendment, modification or supplement thereto. “Net Cash Proceeds” means, with respect to any Asset Sale, the proceeds in the form of cash or Cash Equivalents including payments in respect of deferred payment obligations when received in the form of cash or Cash Equivalents (other than the portion of any such deferred payment constituting interest) received by the Company or any of its Restricted Subsidiaries from such Asset Sale net of: (i) reasonable out-of-pocket expenses and fees relating to such Asset Sale (including legal, accounting and investment banking fees and sales commissions and title and recording tax expenses); (ii) all Federal, state, provincial, foreign and local taxes required to be accrued as a liability under GAAP as a consequence of such Asset Sale; (iii) appropriate amounts to be provided by the Company or any Restricted Subsidiary of the Company, as the case may be, as a reserve, in accordance with GAAP, against any liabilities associated with such Asset Sale and retained by the Company or any Restricted Subsidiary of the Company, as the case may be, after such Asset Sale, including pension and other post- employment benefit liabilities, liabilities related to environmental matters and liabilities under any indemnification obligations associated with such Asset Sale; (iv) all distributions and other payments required to be made to minority interest holders in Restricted Subsidiaries as a result of such Asset Sale; and (v) all payments made on any Indebtedness which is secured by any assets subject to such Asset Sale, in accordance with the terms of any Lien upon or other security agreement of any kind with respect to such assets, or which must by its terms, or in order to obtain a necessary consent to such Asset Sale, or by applicable law, be repaid out of the proceeds from such Asset Sale. “Notes” means, collectively, the Initial Notes and the Additional Notes, treated as a single class of securities, as amended or supplemented from time to time in accordance with the terms hereof, that are issued pursuant to this Indenture. “Notes Collateral Agents” means, collectively, the US Collateral Agent and the UK Collateral Agent and any other collateral agent that accedes to the Intercreditor Agreement as co-collateral agent or additional or separate collateral agent with respect to all or any portion of the Collateral, and any successor to any such other collateral agent. “Notes Obligations” means all Obligations with respect to the Notes pursuant to the Notes, this Indenture, the Security Documents and the Intercreditor Agreement. “Obligations” means all obligations for principal, premium, interest, penalties, fees, indemnifications, reimbursements, damages and other liabilities payable under the documentation governing any Indebtedness. “Officer” means, with respect to any Person (other than the Trustee), the Chairman of the Board, the Chief Executive Officer, the President, the Chief Operating Officer, the Chief Financial Officer, the Treasurer, any Assistant Treasurer, the Controller, the Secretary or any Vice-President of such Person. “Officers’ Certificate” means a certificate signed by two Officers of the Company, one of whom must be the principal executive officer, the principal financial officer, 19

the treasurer or the principal accounting officer of the Company, that meets the requirements of Sections 11.02 and 11.03 hereof. “Opinion of Counsel” means an opinion reasonably acceptable to the Trustee from legal counsel. The counsel may be an employee of, or counsel to, the Company or any Subsidiary of the Company. “Permitted Business” means any business (including stock or assets) that derives a majority of its revenues from the business engaged in by the Company and its Restricted Subsidiaries on the Issue Date and/or activities that are reasonably similar, ancillary or related to, or are a reasonable extension, development or expansion of, the businesses in which the Company and its Restricted Subsidiaries are engaged on the Issue Date. “Permitted Indebtedness” means, without duplication, each of the following: (i) Indebtedness under the Notes (other than any Additional Notes); (ii) Indebtedness of the Company or any of its Restricted Subsidiaries incurred pursuant to the Credit Facilities in an aggregate principal amount at any time outstanding not to exceed $2,900.0 million, less: (a) the aggregate amount of Indebtedness of Securitization Entities at the time outstanding, (b) the amount of all mandatory principal payments actually made by the Company or any such Restricted Subsidiary since the Issue Date with the Net Cash Proceeds of an Asset Sale in respect of term loans under a credit facility (excluding any such payments to the extent refinanced at the time of payment) and (c) any repayments of revolving credit borrowings under the Credit Facilities with the Net Cash Proceeds of an Asset Sale that are accompanied by a corresponding commitment reduction thereunder; provided that the amount of Indebtedness permitted to be incurred pursuant to the Credit Facilities in accordance with this clause (ii) shall be in addition to any Indebtedness permitted to be incurred pursuant to a credit facility in reliance on, and in accordance with, clauses (vii), (xiii), (xiv) and (xv) below; (iii) other Indebtedness of the Company and its Restricted Subsidiaries outstanding on the Issue Date (including the 2024 Notes, the 2025 Notes, the 2026 Notes, the 2026 Secured Notes, the 2027 5.50% Notes, the 2027 7.50% Notes and the UK Notes) reduced by the amount of any scheduled amortization payments or mandatory prepayments when actually paid or permanent reductions thereon; (iv) Interest Swap Obligations of the Company or any of its Restricted Subsidiaries covering Indebtedness of the Company or any of its Restricted Subsidiaries; provided that any Indebtedness to which any such Interest Swap Obligations correspond is otherwise permitted to be incurred under this Indenture; provided, further, that such Interest Swap Obligations are entered into, in the judgment of the Company, to protect the Company or any of its Restricted Subsidiaries from fluctuation in interest rates on its outstanding Indebtedness; (v) Indebtedness of the Company or any Restricted Subsidiary of the Company under Hedging Agreements and Currency Agreements; 20

(vi) the incurrence by the Company or any of its Restricted Subsidiaries of intercompany Indebtedness between or among the Company and any such Restricted Subsidiaries; provided, however, that: (a) if the Company is the obligor on such Indebtedness, and the payee is a Restricted Subsidiary that is not a Guarantor, such Indebtedness is expressly subordinated to the prior payment in full in cash of all Notes Obligations and (b) (1) any subsequent issuance or transfer of Capital Stock that results in any such Indebtedness being held by a Person other than the Company or a Restricted Subsidiary thereof and (2) any sale or other transfer of any such Indebtedness to a Person that is not either the Company or a Restricted Subsidiary thereof (other than by way of granting a Lien permitted under this Indenture or in connection with the exercise of remedies by a secured creditor) shall be deemed, in each case, to constitute an incurrence of such Indebtedness by the Company or such Restricted Subsidiary, as the case may be, that was not permitted by this clause (vi); (vii) Indebtedness (including Capitalized Lease Obligations) incurred by the Company or any of its Restricted Subsidiaries to finance the purchase, lease or improvement of property (real or personal) or equipment (whether through the direct purchase of assets or the Capital Stock of any person owning such assets) in an aggregate principal amount outstanding not to exceed the greater of (x) $250.0 million and (y) 12.0% of the Consolidated EBITDA of the Company for the period of four fiscal quarters most recently ended more than forty-five (45) days prior to the date of determination; (viii) Refinancing Indebtedness (other than Refinancing Indebtedness with respect to Indebtedness incurred pursuant to clause (ii) of this definition); (ix) guarantees by the Company and its Restricted Subsidiaries of each other’s Indebtedness; provided that such Indebtedness is permitted to be incurred under this Indenture; provided, further, that in the event such Indebtedness (other than Acquired Indebtedness) is Ratio Indebtedness, such guarantees are by the Company or a Guarantor only; (x) Indebtedness arising from agreements of the Company or a Restricted Subsidiary of the Company providing for indemnification, adjustment of purchase price, earn-out or other similar obligations, in each case, incurred or assumed in connection with the disposition of any business, assets or a Restricted Subsidiary of the Company, other than guarantees of Indebtedness incurred by any Person acquiring all or any portion of such business, assets or Restricted Subsidiary for the purpose of financing such acquisition; provided that the maximum assumable liability in respect of all such Indebtedness shall at no time exceed the gross proceeds actually received by the Company and its Restricted Subsidiaries in connection with such disposition; (xi) obligations in respect of performance and surety bonds and completion guarantees provided by the Company or any Restricted Subsidiary of the Company in the ordinary course of business; 21

(xii) the incurrence by a Securitization Entity of Indebtedness in a Qualified Securitization Transaction that is non-recourse to the Company or any Subsidiary of the Company (except for Standard Securitization Undertakings); (xiii) Indebtedness incurred by the Company or any of the Guarantors in connection with the acquisition of a Permitted Business; provided that on the date of the incurrence of such Indebtedness, after giving effect to the incurrence thereof and the use of proceeds therefrom, either (A) the Company would be permitted to incur at least $1.00 of additional Ratio Indebtedness or (B) the Consolidated Fixed Charge Coverage Ratio of the Company would be greater than the Consolidated Fixed Charge Coverage Ratio of the Company immediately prior to the incurrence of such Indebtedness; (xiv) additional Indebtedness of the Company and the Guarantors (which amount may, but need not, be incurred in whole or in part under a credit facility) (it being understood that any Indebtedness incurred pursuant to this clause (xiv) shall cease to be deemed incurred or outstanding for purposes of this clause (xiv) but shall be deemed incurred pursuant to Section 4.09 hereof from and after the first date on which the Company or such Restricted Subsidiary could have incurred such Indebtedness pursuant to Section 4.09 hereof without reliance on this clause (xiv), subject to further redivision and reclassification pursuant to the final paragraph of this definition) in an aggregate principal amount that does not exceed the greater of (x) $250.0 million and (y) 12.0% of the Consolidated EBITDA of the Company for the period of four fiscal quarters most recently ended more than forty-five (45) days prior to the date of determination; (xv) additional Indebtedness of the Foreign Restricted Subsidiaries in an aggregate principal amount which (when combined with the liquidation value of all series of outstanding Permitted Subsidiary Preferred Stock) does not exceed the greater of (x) $450.0 million and (y) 20.0% of the Consolidated EBITDA of the Company for the period of four fiscal quarters most recently ended more than forty-five (45) days prior to the date of determination, at any one time outstanding (which amount may, but need not, be incurred in whole or in part under a credit facility); (it being understood that any Indebtedness incurred pursuant to this clause (xv) shall cease to be deemed incurred or outstanding for purposes of this clause (xv) but shall be deemed incurred pursuant to Section 4.09 hereof from and after the first date on which the Company or such Restricted Subsidiary could have incurred such Indebtedness pursuant to Section 4.09 hereof without reliance on this clause (xv), subject to further redivision and reclassification pursuant to the final paragraph of this definition); (xvi) Indebtedness arising from the honoring by a bank or other financial institution of a check, draft or similar instrument inadvertently (except in the case of daylight overdrafts) drawn against insufficient funds in the ordinary course of business; provided, however, that such Indebtedness is extinguished within five Business Days of incurrence; and (xvii) Indebtedness of the Company or any of its Restricted Subsidiaries represented by letters of credit for the account of the Company or such Restricted Subsidiary, as the case may be, issued in the ordinary course of business of the Company 22

or such Restricted Subsidiary, including in order to provide security for workers’ compensation claims or payment obligations in connection with self-insurance or similar requirements in the ordinary course of business and other Indebtedness with respect to workers’ compensation claims, self-insurance obligations, performance, surety and similar bonds and completion guarantees provided by the Company or any Restricted Subsidiary of the Company in the ordinary course of business. For purposes of determining compliance with Section 4.09 hereof, in the event that an item of Indebtedness meets the criteria of more than one of the categories of Permitted Indebtedness described in clauses (i) through (xvii) above or is entitled to be incurred pursuant to the Consolidated Fixed Charge Coverage Ratio provisions of Section 4.09 hereof, the Company shall, in its sole discretion, divide and classify (or later redivide and reclassify) such item of Indebtedness in any manner that complies with Section 4.09 hereof. Accrual of interest, accretion or amortization of original issue discount, the payment of interest on any Indebtedness in the form of additional Indebtedness with the same terms, and the payment of dividends on Disqualified Capital Stock in the form of additional shares of the same class of Disqualified Capital Stock will not be deemed to be an incurrence of Indebtedness or an issuance of Disqualified Capital Stock for purposes of Section 4.09 hereof. “Permitted Investments” means: (i) Investments by the Company or any Restricted Subsidiary of the Company in the Company or any Restricted Subsidiary of the Company (other than a Restricted Subsidiary of the Company in which an Affiliate of the Company that is not a Restricted Subsidiary of the Company holds a minority interest) (whether existing on the Issue Date or created thereafter) or any other Person (including by means of any transfer of cash or other property) if, as a result of such Investment, such other Person shall become a Restricted Subsidiary of the Company (other than a Restricted Subsidiary of the Company in which an Affiliate of the Company that is not a Restricted Subsidiary of the Company holds a minority interest) or that will merge with or consolidate into the Company or a Restricted Subsidiary of the Company and Investments in the Company by the Company or any Restricted Subsidiary of the Company; (ii) Investments in cash and Cash Equivalents; (iii) Investments in property and other assets owned or used by the Company or any Restricted Subsidiary in the ordinary course of business; (iv) loans and advances (including payroll, travel and similar advances) to employees and officers of the Company and its Restricted Subsidiaries for bona fide business purposes incurred in the ordinary course of business or consistent with past practice or to fund such Person’s purchase of Capital Stock of the Company or any direct or indirect parent of the Company pursuant to compensatory plans approved by the Board of Directors in good faith; (v) Currency Agreements, Hedging Agreements and Interest Swap Obligations entered into in the ordinary course of business and otherwise in compliance with this Indenture; (vi) Investments in securities of trade creditors or customers received pursuant to any plan of reorganization or similar arrangement upon the bankruptcy or insolvency of such trade creditors or customers or in good faith settlement of delinquent obligations of such trade creditors or customers; (vii) Investments made by the Company or its Restricted Subsidiaries as a result of consideration received in connection with an Asset Sale made in compliance with Section 4.10 hereof; (viii) Investments required pursuant to any agreement or obligation of the Company or a Restricted Subsidiary, in effect on the Issue Date, to make such Investments; (ix) Investments existing on the Issue Date; (x) accounts receivable created or acquired and advances to suppliers created or incurred in the ordinary course of business; (xi) guarantees by 23

the Company or a Restricted Subsidiary of the Company permitted to be incurred under this Indenture; (xii) additional Investments having an aggregate fair market value, taken together with all other Investments made pursuant to this clause (xii) that are at that time outstanding, not to exceed the greater of (A) $500.0 million and (B) 25.0% of the Company’s Total Assets; (xiii) any Investment by the Company or a Subsidiary of the Company in a Securitization Entity or any Investment by a Securitization Entity in any other Person in connection with a Qualified Securitization Transaction; provided that any Investment in a Securitization Entity is in the form of a Purchase Money Note or an equity interest; (xiv) Investments the payment for which consists exclusively of Qualified Capital Stock of the Company; (xv) guarantees by the Company or any Restricted Subsidiary of the Company of Indebtedness of the Company or a Restricted Subsidiary of the Company permitted by Section 4.09 hereof; (xvi) any Investment in any Person to the extent it consists of prepaid expenses, negotiable instruments held for collection and lease, utility and workers’ compensation, performance and other similar deposits made in the ordinary course of business; and (xvii) Investments by the Company or any Restricted Subsidiary in any Unrestricted Subsidiary not exceeding the greater of (x) $250.0 million and (y) 12.0% of the Consolidated EBITDA of the Company for the period of four fiscal quarters most recently ended more than forty-five (45) days prior to the date of determination in the aggregate for all such Investments in Unrestricted Subsidiaries. “Permitted Liens” means, with respect to any Person: (i) Liens created under this Indenture or any Security Documents securing the Notes Obligations; (ii) Liens securing the 2026 Secured Notes Obligations with respect to the 2026 Secured Notes in existence on the Issue Date. (iii) Liens securing Bank Indebtedness; (iv) pledges or deposits by such Person under workmen’s compensation laws, unemployment insurance laws or similar legislation, or good faith deposits to secure bids, tenders, contracts (other than for the payment of Indebtedness) or leases to which such Person is a party, or deposits to secure public or statutory obligations of such Person or deposits of cash or U.S. government bonds to secure surety or appeal bonds to which such Person is a party, or deposits as security for contested taxes or import duties or for the payment of rent, in each case incurred in the ordinary course of business; (v) Liens imposed by law, such as carriers’, warehousemen’s and mechanics’ Liens and other similar Liens, in each case, for sums not yet overdue for a period of more than 30 days or being contested in good faith by appropriate proceedings or other Liens arising out of judgments or awards against such Person with respect to which such Person shall then be proceeding with an appeal or other proceedings for review, if adequate reserves with respect thereto are maintained on the books of such Person in accordance with GAAP; (vi) Liens for taxes, assessments or other governmental charges or claims not yet overdue for a period of more than 30 days or payable or subject to penalties for nonpayment or which are being contested in good faith by appropriate proceedings diligently conducted, if 24

adequate reserves with respect thereto are maintained on the books of such Person in accordance with GAAP; (vii) Liens in favor of issuers of performance and surety bonds or bid bonds or with respect to other regulatory requirements or letters of credit issued pursuant to the request of and for the account of such Person in the ordinary course of its business; (viii) minor survey exceptions, minor encumbrances, easements or reservations of, or rights of others for, licenses, rights-of-way, sewers, electric lines, telegraph and telephone lines and other similar purposes, or zoning or other restrictions as to the use of real properties or Liens incidental to the conduct of the business of such Person or to the ownership of its properties, in each case, which were not incurred in connection with Indebtedness and which do not in the aggregate materially impair their use in the operation of the business of such Person; (ix) Liens existing on the Issue Date (other than Liens permitted by clauses (i), (ii) and (iii) of this definition); provided that (a) such Liens shall secure only those obligations which they secure on the Issue Date and any Refinancing Indebtedness of such obligations permitted pursuant to clause (viii) of the definition of “Permitted Indebtedness” and (b) such Liens may not extend to any other property of the Company or any Guarantor; (x) Liens on property or shares of stock of a Person at the time such Person becomes a Restricted Subsidiary; provided that such Liens are not created or incurred in connection with, or in contemplation of, such other Person becoming such a Restricted Subsidiary; provided further, that such Liens may not extend to any other property owned by the Company or any Restricted Subsidiary and shall secure only obligations which such Liens secure immediately prior to the time such Person becomes a Restricted Subsidiary; (xi) Liens on property at the time the Company or a Restricted Subsidiary acquired the property, including any acquisition by means of a merger or consolidation with or into the Company or any Restricted Subsidiary; provided that such Liens are not created or incurred in connection with, or in contemplation of, such acquisition; provided further, that the Liens may not extend to any other property owned by the Company or any Restricted Subsidiary and shall secure only obligations which such Liens secure immediately prior to such acquisition; (xii) Liens securing Indebtedness or other obligations of a Restricted Subsidiary owing to the Company or another Restricted Subsidiary permitted to be incurred pursuant to Section 4.09 hereof; (xiii) Liens on specific items of inventory or other goods and proceeds of any Person securing such Person’s obligations in respect of bankers’ acceptances issued or created for the account of such Person to facilitate the purchase, shipment or storage of such inventory or other goods; (xiv) leases and subleases granted to others in the ordinary course of business which do not materially adversely affect the ordinary conduct of the business of the Company or any of the Restricted Subsidiaries and do not secure any Indebtedness; 25

(xv) Liens arising from financing statement filings under the UCC or similar state laws regarding operating leases entered into by the Company and its Restricted Subsidiaries in the ordinary course of business; (xvi) Liens in favor of the Company or any Guarantor; (xvii) Liens on inventory or equipment of the Company or any Restricted Subsidiary granted in the ordinary course of business to the Company’s client at which such inventory or equipment is located; (xviii) Qualified Securitization Transactions permitted pursuant to clauses (ii)(a) and (xii) of the definition of “Permitted Indebtedness,” and Liens on accounts receivable, interests therein, related assets of the type described in the definition of “Qualified Securitization Transaction” and the proceeds of all of the foregoing existing or deemed to exist in connection with any such Qualified Securitization Transaction; (xix) Liens to secure any refinancing, refunding, extension, renewal or replacement (or successive refinancing, refunding, extensions, renewals or replacements) as a whole, or in part, of any Indebtedness secured by any Lien referred to in clauses (i), (ii), (iii), (x), (xi), (xviii), (xx) and (xxxi) of this definition; provided that (a) such new Lien shall be limited to all or part of the same property that secured the original Lien (plus improvements on such property), (b) the Indebtedness secured by such Lien at such time is not increased to any amount greater than the sum of (1) the outstanding principal amount or, if greater, committed amount of the Indebtedness described under clauses (i), (ii), (iii), (x), (xi), (xviii), (xx) and (xxxi) of this definition at the time the original Lien became a Permitted Lien pursuant this Indenture, and (2) an amount necessary to pay any fees and expenses, including premiums, related to such refinancing, refunding, extension, renewal or replacement and (c) such refinancing, refunding, extension, renewal or replacement is Refinancing Indebtedness permitted under the definition of “Permitted Indebtedness”; (xx) Liens securing Indebtedness permitted to be incurred pursuant to clauses (vii) and (xiv) of the definition of “Permitted Indebtedness”; provided that (a) Liens securing Indebtedness permitted to be incurred pursuant to such clause (vii) do not at any time encumber any property other than the property financed by such Indebtedness and the proceeds and the products thereof and (b) Liens securing Indebtedness permitted to be incurred pursuant to such clause (xiv) do not encumber any asset other than any asset constituting Collateral; (xxi) Liens securing Indebtedness of Foreign Restricted Subsidiaries permitted to be incurred pursuant to this Indenture to the extent such Liens extend only to the assets of Foreign Restricted Subsidiaries; (xxii) deposits in the ordinary course of business to secure liability to insurance carriers; (xxiii) Liens securing judgments for the payment of money not constituting an Event of Default under clause (e) of the definition of “Events of Default”, so long as such Liens are adequately bonded and any appropriate legal proceedings that may have been duly initiated 26

for the review of such judgment have not been finally terminated or the period within which such proceedings may be initiated has not expired; (xxiv) Liens in favor of customs and revenue authorities arising as a matter of law to secure payment of customs duties in connection with the importation of goods in the ordinary course of business; (xxv) Liens (a) of a collection bank arising under Section 4-210 of the UCC on items in the course of collection, (b) attaching to commodity trading accounts or other commodity brokerage accounts incurred in the ordinary course of business and (c) in favor of banking institutions arising as a matter of law encumbering deposits (including the right of set-off) and which are within the general parameters customary in the banking industry; (xxvi) Liens that are contractual rights of set-off (a) relating to the establishment of depository relations with banks not given in connection with the issuance of Indebtedness, (b) relating to pooled deposit or sweep accounts of the Company or any of its Restricted Subsidiaries to permit satisfaction of overdraft or similar obligations incurred in the ordinary course of business of the Company and its Restricted Subsidiaries or (c) relating to purchase orders and other agreements entered into with customers of the Company or any of its Restricted Subsidiaries in the ordinary course of business; (xxvii) Liens encumbering reasonable customary initial deposits and margin deposits and similar Liens attaching to commodity trading accounts or other brokerage accounts incurred in the ordinary course of business and not for speculative purposes; (xxviii) Liens deemed to exist in connection with Investments in repurchase agreements permitted pursuant to Section 4.09 hereof; provided that such Liens do not extend to any assets other than those assets that are the subject of such repurchase agreement; (xxix) other Liens securing obligations incurred in the ordinary course of business which obligations do not exceed the greater of (x) $50 million and (y) 2.0% of the Consolidated EBITDA of the Company for the period of four fiscal quarters most recently ended more than forty-five (45) days prior to the date of determination, at any one time outstanding; (xxx) Liens securing Interest Swap Obligations, so long as the related Indebtedness is, and is permitted to be incurred pursuant Section 4.12 hereof, secured by a Lien on the same property securing such Interest Swap Obligations; (xxxi) Liens securing Indebtedness permitted to be incurred pursuant to clause (xviii) of the definition of “Permitted Indebtedness”; and (xxxii) Liens securing obligations with respect to Ratio Indebtedness; provided that, at the time of the incurrence of any Ratio Indebtedness secured by such a Lien and after giving effect thereto and to the use of the proceeds thereof and any other transactions associated therewith, the Consolidated Secured Net Debt Ratio shall not exceed 5.25 to 1.00 (provided that if such Ratio Indebtedness is to be used in whole or in part to finance a Limited Condition Acquisition, the Consolidated Secured Net Debt Ratio shall be determined solely as of the date 27

on which the definitive documentation with respect to such Limited Condition Acquisition is entered into). “Permitted Subsidiary Preferred Stock” means any series of Preferred Stock of a Foreign Restricted Subsidiary that constitutes Qualified Capital Stock, the liquidation value of all series of which, when combined with the aggregate amount of outstanding Indebtedness of the Foreign Restricted Subsidiaries incurred pursuant to clause (xv) of the definition of Permitted Indebtedness, does not (on a pro forma basis) exceed the greater of (x) $15.0 million and (y) 0.5% of the Consolidated EBITDA of the Company for the period of four fiscal quarters most recently ended more than forty-five (45) days prior to the date of determination. “Person” means an individual, partnership, corporation, limited liability company, unincorporated organization, trust or joint venture, or a governmental agency or political subdivision thereof. “Preferred Stock” of any Person means any Capital Stock of such Person that has preferential rights to any other Capital Stock of such Person with respect to dividends or redemptions or upon liquidation. “Productive Assets” means assets (including Capital Stock) that are used or usable by the Company and its Restricted Subsidiaries in Permitted Businesses. “Purchase Money Note” means a promissory note of a Securitization Entity evidencing a line of credit, which may be irrevocable, from the Company or any Subsidiary of the Company in connection with a Qualified Securitization Transaction to a Securitization Entity, which note shall be repaid from cash available to the Securitization Entity, other than amounts required to be established as reserves pursuant to agreements, amounts paid to investors in respect of interest and principal and amounts paid in connection with the purchase of newly generated receivables or newly acquired equipment. “Qualified Capital Stock” means any Capital Stock that is not Disqualified Capital Stock. “Qualified Proceeds” means assets that are used or useful in, or Capital Stock of any Person engaged in, a Permitted Business; provided that the fair market value of any such assets or Capital Stock shall be determined by the Board of Directors of the Company in good faith. “Qualified Securitization Transaction” means any transaction or series of transactions that may be entered into by the Company or any of its Restricted Subsidiaries pursuant to which the Company or any of its Subsidiaries may sell, convey or otherwise transfer to (i) a Securitization Entity (in the case of a transfer by the Company or any of its Restricted Subsidiaries); and (ii) any other Person (in the case of a transfer by a Securitization Entity), or may grant a security interest in any accounts receivable or equipment (whether now existing or arising or acquired in the future) of the Company or any of its Restricted Subsidiaries, and any assets related thereto including all collateral securing such accounts receivable and equipment, all contracts and contract rights and all guarantees or other obligations in respect of such accounts receivable and equipment, proceeds of such accounts receivable and equipment and 28

other assets (including contract rights) which are customarily transferred or in respect of which security interests are customarily granted in connection with assets securitization transactions involving accounts receivable and equipment. For the avoidance of doubt, transactions consummated under the A/R Facility (as in effect on the Issue Date) are Qualified Securitization Transactions. “Quotation Agent” means the Reference Treasury Dealer selected by the Company. “Rating Agencies” means Xxxxx’x and S&P or, if Xxxxx’x or S&P or both shall not make a rating on the Notes publicly available, a nationally recognized statistical rating agency or agencies, as the case may be, selected by the Company that shall be substituted for Xxxxx’x or S&P or both, as the case may be. “Reference Treasury Dealer” means each of Xxxxxx Xxxxxxx & Co. LLC, Xxxxxxx Sachs & Co. LLC and their successors and assigns and Credit Suisse Securities (USA) LLC and its successors and assigns, and any two other primary U.S. Government securities dealers in New York City as may be selected by the Company. “Reference Treasury Dealer Quotations” means, with respect to each Reference Treasury Dealer and any redemption date, the average, as determined by the Company, of the bid and asked prices for the Comparable Treasury Issue, expressed in each case as a percentage of its principal amount, quoted in writing to the Company by such Reference Treasury Dealer at 5:00 p.m., New York City time, on the third Business Day immediately preceding date that the applicable redemption notice is first sent or mailed. “Refinance” means, in respect of any security or Indebtedness, to refinance, extend, renew, refund, repay, prepay, redeem, defease or retire, or to issue a security or Indebtedness in exchange or replacement for, such security or Indebtedness in whole or in part. “Refinanced” and “Refinancing” shall have correlative meanings. “Refinancing Indebtedness” means any Refinancing, modification, replacement, restatement, refunding, deferral, extension, substitution, supplement, reissuance or resale of Indebtedness existing on the Issue Date or thereafter incurred (other than intercompany Indebtedness), including any additional Indebtedness incurred to pay interest or premiums required by the instruments governing such then-existing or thereafter-incurred future Indebtedness as in effect at the time of issuance thereof (“Required Premiums”) and fees in connection therewith; provided that any such event shall not (i) directly or indirectly result in an increase in the aggregate principal amount of Permitted Indebtedness (except to the extent such increase is a result of a simultaneous incurrence of additional Indebtedness (A) to pay Required Premiums and related fees or (B) otherwise permitted to be incurred under this Indenture); and (ii) create Indebtedness with a Weighted Average Life to Maturity at the time such Indebtedness is incurred that is less than the Weighted Average Life to Maturity at such time of the Indebtedness being refinanced, modified, replaced, renewed, restated, refunded, deferred, extended, substituted, supplemented, reissued or resold. 29

“Required Premiums” has the meaning set forth in the definition of Refinancing Indebtedness. “Responsible Officer” means, when used with respect to the Trustee, any officer within the Corporate Trust Administration of the Trustee (or any successor group of the Trustee) who has direct responsibility for the administration of this Indenture and means, with respect to a particular corporate trust matter, any other officer to whom such matter is referred because of his knowledge of and familiarity with the particular subject. “Restricted Subsidiary” of any Person means any Subsidiary of such Person which at the time of determination is not an Unrestricted Subsidiary. “S&P” means S&P Global Ratings (a division of S&P Global Inc.), or any successor thereto. “Sale and Leaseback Transaction” means any direct or indirect arrangement with any Person or to which any such Person is a party, providing for the leasing to the Company or a Restricted Subsidiary of the Company of any property, whether owned by the Company or any such Restricted Subsidiary at the Issue Date or later acquired, which has been or is to be sold or transferred by the Company or such Restricted Subsidiary to such Person or to any other Person from whom funds have been or are to be advanced by such Person on the security of such property. “SEC” means the U.S. Securities and Exchange Commission. “Secured Debt” means any Indebtedness secured by a Lien. “Securities Act” means the Securities Act of 1933, as amended. “Securitization Entity” means a Wholly Owned Subsidiary of the Company (or another Person in which the Company or any Subsidiary of the Company makes an Investment and to which the Company or any Subsidiary of the Company transfers accounts receivable or equipment and related assets) which engages in no activities other than in connection with the financing of accounts receivable or equipment and: (i) no portion of the Indebtedness or any other Obligations (contingent or otherwise) of which (A) is guaranteed by the Company or any Restricted Subsidiary of the Company (excluding guarantees of obligations (other than the principal of, and interest on, Indebtedness) pursuant to Standard Securitization Undertakings); (B) is recourse to or obligates the Company or any Restricted Subsidiary of the Company in any way other than pursuant to Standard Securitization Undertakings; or (C) subjects any property or asset of the Company or any Restricted Subsidiary of the Company, directly or indirectly, contingently or otherwise, to the satisfaction thereof, other than pursuant to Standard Securitization Undertakings; (ii) with which neither the Company nor any Restricted Subsidiary of the Company has any material contract, agreement, arrangement or understanding other than on terms, taken as a whole, no less favorable to the Company or such Restricted Subsidiary than those that might be obtained at the time from Persons that are not Affiliates of the Company, other than fees payable in the ordinary course of business in connection with servicing receivables of such entity; (iii) to which neither the Company nor any Restricted Subsidiary of the Company has any obligations to maintain or preserve such entity’s financial condition or 30

cause such entity to achieve certain levels of operating results; and (iv) which is designated by the Board of Directors of the Company as a Securitization Entity. Any such designation by the Board of Directors of the Company shall be evidenced to the Trustee by filing with the Trustee a certified copy of the Board Resolution of the Company giving effect to such designation and an Officers’ Certificate certifying that such designation complied with the foregoing conditions. For the avoidance of doubt, TransDigm Receivables LLC constitutes a Securitization Entity as of the Issue Date. “Security Agreement” means the Pledge and Security Agreement, dated as of the Issue Date, among the Company, Holdings, the Guarantors and the US Collateral Agent, as amended, restated, amended and restated, renewed, replaced, supplemented or otherwise modified from time to time. “Security Documents” means, collectively, the Security Agreement, the Debenture, the Mortgages, the control agreements, the intellectual property security agreements and any other documents granting a Lien upon the Collateral in favor of the Trustee for the ratable benefit of the Holders as security for payment of the Notes Obligations. “Senior Debt” means the principal of, premium, if any, and interest (including any interest accruing subsequent to the filing of a petition of bankruptcy at the rate provided for in the documentation with respect thereto, whether or not such interest is an allowed claim under applicable law) on, any Indebtedness of the Company, Holdings or any Guarantor, whether outstanding on the Issue Date or thereafter created, incurred or assumed, unless, in the case of any particular Indebtedness, the instrument creating or evidencing the same or pursuant to which the same is outstanding expressly provides that such Indebtedness shall be subordinate or pari passu in right of payment to the Notes or the Guarantees, as the case may be. Without limiting the generality of the foregoing, “Senior Debt” shall also include the principal of, premium, if any, interest (including any interest accruing subsequent to the filing of a petition of bankruptcy at the rate provided for in the documentation with respect thereto, whether or not such interest is an allowed claim under applicable law) on, and all other amounts owing in respect of: (x) all monetary obligations of every nature of the Company, Holdings or any Guarantor under the Credit Facilities, including obligations to pay principal and interest, reimbursement obligations under letters of credit, fees, expenses and indemnities, (y) all Interest Swap Obligations (and guarantees thereof) and (z) all obligations (and guarantees thereof) under Currency Agreements and Hedging Agreements, in each case whether outstanding on the Issue Date or thereafter incurred. Notwithstanding the foregoing, “Senior Debt” shall not include (i) any Indebtedness of the Company, Holdings or a Guarantor to the Company, Holdings or to a Subsidiary of the Company, (ii) any Indebtedness of the Company, Holdings or any Guarantor to, or guaranteed by the Company, Holdings or any Guarantor on behalf of, any shareholder, director, officer or employee of the Company, Holdings or any Subsidiary of the Company (including amounts owed for compensation) other than a shareholder who is also a lender (or an Affiliate of a lender) under the Credit Facilities, (iii) any amounts payable or other liability to 31

trade creditors arising in the ordinary course of business (including guarantees thereof or instruments evidencing such liabilities but excluding secured purchase money obligations); (iv) Indebtedness represented by Disqualified Capital Stock, (v) any liability for Federal, state, local or other taxes owed or owing by the Company, Holdings or any of the Guarantors, (vi) that portion of any Indebtedness incurred in violation of Section 4.09 hereof (but, as to any such obligation, no such violation shall be deemed to exist for purposes of this clause (vi) if the holder(s) of such obligation or their representative and the Trustee shall have received an Officers’ Certificate of the Company to the effect that the incurrence of such Indebtedness does not (or in the case of revolving credit indebtedness, that the incurrence of the entire committed amount thereof at the date on which the initial borrowing thereunder is made would not) violate such provisions of this Indenture), (vii) Indebtedness which, when incurred and without respect to any election under Section 1111(b) of Xxxxx 00, Xxxxxx Xxxxxx Code, is without recourse to the Company, Holdings or any of the Guarantors, as applicable, and (viii) any Indebtedness which is, by its express terms, subordinated in right of payment to any other Indebtedness of the Company, Holdings or any of the Guarantors. “Senior Secured Debt” means any Senior Debt that is Secured Debt. “Subordinated Debt” means, with respect to a Person, the 2024 Notes, the 2025 Notes, the 2026 Notes, the 2027 5.50% Notes and the 2027 7.50% Notes (in the case of the Company) and the UK Notes (in the case of TransDigm UK Holdings plc), the guarantees of the 2024 Notes, the 2025 Notes, the 2026 Notes, the 2027 5.50% Notes, the 2027 7.50% Notes and the UK Notes (in the case of a Guarantor or Holdings) and any other Indebtedness of such Person that specifically provides that such Indebtedness is subordinated by its terms in right of payment to any Indebtedness or other obligation of such Person which is not Senior Debt of such Person. “Significant Subsidiary” means, with respect to any Person, any Restricted Subsidiary of such Person that satisfies the criteria for a “significant subsidiary” set forth in Rule 1-02(w) of Regulation S-X under the Securities Act. “Standard Securitization Undertakings” means representations, warranties, covenants and indemnities entered into by the Company or any Subsidiary of the Company which are reasonably customary, as determined in good faith by the Board of Directors of the Company, in an accounts receivable or equipment transaction. “Subsidiary”, with respect to any Person, means (i) any corporation of which the outstanding Capital Stock having at least a majority of the votes entitled to be cast in the election of directors under ordinary circumstances shall at the time be owned, directly or indirectly, by such Person; or (ii) any other Person of which at least a majority of the voting interest under ordinary circumstances is at the time, directly or indirectly, owned by such Person. “TIA” means the Trust Indenture Act of 1939, as amended (15 U.S.C. §§ 77aaa-77bbbb). 32

“Total Assets” means, as of any date, the total consolidated assets of the Company and its Restricted Subsidiaries, as set forth on the Company’s most recently available internal consolidated balance sheet as of such date. “Transaction” means the offering of the Notes as described in the Final Offering Memorandum. “Transaction Date” has the meaning set forth in the definition of Consolidated Fixed Charge Coverage Ratio. “TransDigm UK” means TransDigm UK Holdings plc, a public limited company incorporated under the laws of England and Wales. “Trustee” means the party named as such above until a successor replaces it in accordance with the applicable provisions of this Indenture and thereafter means the successor serving hereunder. “UCC” means the Uniform Commercial Code as in effect from time to time in the state of New York or any other state, the laws of which are required to be applied in connection with the issue of perfection of security interests. “UK Collateral Agent” means the party named as such above, in its capacity as notes collateral agent with respect to the Debenture Collateral pursuant to the Debenture, until a successor replaces it in accordance with the applicable provisions of this Indenture and thereafter means the successor serving hereunder. “UK Notes” means TransDigm UK’s 6.875% Senior Subordinated Notes due 2026 issued under the Indenture dated May 8, 2018, among TransDigm UK, the Company, Holdings and the guarantors from time to time party thereto and The Bank of New York Mellon Trust Company, N.A., as Trustee. “Unrestricted Cash” means unrestricted cash and Cash Equivalents owned by Holdings, the Company and its Restricted Subsidiaries and not controlled by or subject to any Lien or other preferential arrangement in favor of any creditor (other than Liens created by or pursuant to the Indenture and the Security Documents or Liens in favor of the agent or holders of other Senior Secured Debt, which may be shared ratably with the holders of any other Senior Secured Debt permitted under this Indenture). “Unrestricted Subsidiary” of any Person means (i) any Subsidiary of such Person that at the time of determination shall be, or continue to be, designated an Unrestricted Subsidiary by the Board of Directors of such Person in the manner provided below; and (ii) any Subsidiary of an Unrestricted Subsidiary. The Board of Directors of the Company may designate any Subsidiary (including any newly-acquired or newly-formed Subsidiary) to be an Unrestricted Subsidiary unless such Subsidiary owns any Capital Stock of, or owns or holds any Lien on any property of, the Company or any other Subsidiary of the Company that is not a Subsidiary of the Subsidiary to be so designated or another Unrestricted Subsidiary; provided that (i) the Company certifies to the 33

(b) The Registrar shall not be required to register the transfer of or exchange any Note selected for redemption in whole or in part, except the unredeemed portion of any Note being redeemed in part. (c) All Notes issued upon any registration of transfer or exchange of Notes shall be the valid obligations of the Company, evidencing the same debt, and entitled to the same benefits under this Indenture, as the Notes surrendered upon such registration of transfer or exchange. (d) The Company shall not be required (i) to issue, to register the transfer of or to exchange any Notes during a period beginning at the opening of business 15 days before the day of the mailing of notice of redemption under Section 3.03 hereof and ending at the close of business on such day, (ii) to register the transfer of or to exchange any Note so selected for redemption in whole or in part, except the unredeemed portion of any Note being redeemed in part or (iii) to register the transfer of or to exchange a Note between a record date and the next succeeding interest payment date. (e) Any Holder of a Global Note shall, by acceptance of such Global Note, agree that transfers of beneficial interests in such Global Note may be effected only through a book-entry system maintained by (i) the Holder of such Global Note (or its agent or the person on whose behalf the Global Note is held) or (ii) any Holder of a beneficial interest in such Global Note, and that ownership of beneficial interest in such Global Note shall be required to be reflected in a book entry. (f) Prior to due presentment for the registration of a transfer of any Note, the Trustee, any Paying Agent, the Registrar and the Company may deem and treat the Person in whose name any Note is registered as the absolute owner of such Note for the purpose of receiving payment of principal of, premium, if any, and interest on such Notes and for all other purposes, and none of the Trustee, any Paying Agent, the Registrar or the Company shall be affected by notice to the contrary. (g) None of the Company, the Trustee, any agent of the Company or the Trustee (including any Paying Agent or Registrar) will have any responsibility or liability for any aspect of the records relating to or payments made on account of beneficial ownership interests of a global Note or for maintaining, supervising or reviewing any records relating to such beneficial ownership interests. (h) The Trustee shall have no obligation or duty to monitor, determine or inquire as to compliance with any restrictions on transfer imposed under this Indenture or under applicable law with respect to any transfer of any interest in any Note (including any transfers between or among depositary participants or beneficial owners of interest in any global security) other than to require delivery of such certificates and other documentation or evidence as are expressly required by, and to do so if and when expressly required by the terms of, this Indenture, and to examine the same to determine substantial compliance as to form with the express requirements hereof. 39

Section 4.10 hereof) or, if less than the Net Proceeds Offer Amount has been tendered, all Notes tendered in response to the Net Proceeds Offer. Payment for any Notes so purchased shall be made in the same manner as interest payments are made. If the Purchase Date is on or after an interest record date and on or before the related interest payment date, any accrued and unpaid interest shall be paid to the Person in whose name a Note is registered at the close of business on such record date, and no additional interest shall be payable to Holders who tender Notes pursuant to the Net Proceeds Offer. Upon the commencement of a Net Proceeds Offer, the Company shall send, by first class mail, a notice to the Trustee and each of the Holders. The notice shall contain all instructions and materials necessary to enable such Holders to tender Notes pursuant to the Net Proceeds Offer. The Net Proceeds Offer shall be made to all Holders. The notice, which shall govern the terms of the Net Proceeds Offer, shall state: (a) that the Net Proceeds Offer is being made pursuant to this Section 3.09 and Section 4.10 hereof and the length of time the Net Proceeds Offer shall remain open and, if the Net Proceeds Offer is also made to holders of other Senior Secured Debt of the Company or a Restricted Subsidiary of the Company pursuant to Section 4.10 hereof, the notice shall identify such Senior Secured Debt and state that the Net Proceeds Offer is also made to holders of such Senior Secured Debt; (b) the Net Proceeds Offer Amount, the purchase price and the Purchase Date; (c) that any Note not tendered or accepted for payment shall continue to accrue interest; (d) that, unless the Company defaults in making such payment, any Note accepted for payment pursuant to the Net Proceeds Offer shall cease to accrue interest after the Purchase Date; (e) that Holders electing to have a portion of a Note purchased pursuant to a Net Proceeds Offer may only elect to have such Note purchased in denominations of $2,000 and integral multiples of $1,000 in excess thereof; (f) that Holders electing to have a Note purchased pursuant to any Net Proceeds Offer shall be required to surrender the Note, with the form entitled “Option of Holder to Elect Purchase” on the reverse of the Note completed, or transfer by book-entry transfer, to the Company, a depositary, if appointed by the Company, or a Paying Agent at the address specified in the notice at least three days before the Purchase Date; (g) that Holders shall be entitled to withdraw their election if the Company, the depositary or the Paying Agent, as the case may be, receives, not later than the expiration of the Offer Period, a telegram, telex, facsimile transmission or letter setting forth the name of the Holder, the principal amount of the Note the Holder delivered for purchase and a statement that such Holder is withdrawing its election to have such Note purchased; 46

(h) that, if the aggregate principal amount of Notes surrendered by Holders and other Senior Secured Debt surrendered by the holders thereof exceeds the Offer Amount, the Company shall select the Notes and other Senior Secured Debt of the Company or a Restricted Subsidiary of the Company to be purchased in accordance with the depository’s procedures (based on the amounts of Notes and such other Senior Secured Debt tendered and with such adjustments as may be deemed appropriate by the Company so that only Notes or other Senior Secured Debt in denominations of $2,000 and integral multiples of $1,000 in excess thereof, shall be purchased); and (i) that Holders whose Notes were purchased only in part shall be issued new Notes equal in principal amount to the unpurchased portion of the Notes surrendered (or transferred by book-entry transfer). On or before the Purchase Date, the Company shall, to the extent lawful, accept for payment, on a pro rata basis to the extent necessary, the Net Proceeds Offer Amount of Notes and other Senior Secured Debt of the Company or a Restricted Subsidiary of the Company or portions thereof tendered pursuant to the Net Proceeds Offer, or if less than the Net Proceeds Offer Amount has been tendered, all Notes and other Senior Secured Debt of the Company or a Restricted Subsidiary of the Company or portions thereof tendered, and shall deliver to the Trustee an Officers’ Certificate stating that such Notes or such other Senior Secured Debt or portions thereof were accepted for payment by the Company in accordance with the terms of this Section 3.09. The Company, DTC or the Paying Agent, as the case may be, shall promptly (but in any case not later than five days after the Purchase Date) mail or deliver to each tendering Holder an amount equal to the purchase price of the Notes tendered by such Holder and accepted by the Company for purchase, and the Company shall promptly issue (or cause to be delivered by book-entry transfer) a new Note, and the Trustee, with respect to a Note in certificated form, upon written request from the Company, shall authenticate and mail or deliver such new Note to such Holder, in a principal amount equal to any unpurchased portion of the Note surrendered. Any Note not so accepted shall be promptly mailed or delivered by the Company to the Holder thereof. The Company shall publicly announce the results of the Net Proceeds Offer on the Purchase Date. Other than as specifically provided in this Section 3.09, any purchase pursuant to this Section 3.09 shall be made pursuant to the provisions of Sections 3.01 through 3.06 hereof. To the extent that the provisions of any securities laws or regulations conflict with this Section 3.09 or Section 4.10 hereof, the Company shall comply with the applicable securities laws and regulations and shall not be deemed to have breached its obligations under this Section 3.09 or Section 4.10 hereof. 47

repayment or scheduled sinking fund payment, any Indebtedness of the Company or of any Guarantor, that is subordinate or junior in right of payment to the Notes or any Guarantee, as applicable (other than (w) any Indebtedness permitted under clause (vi) of the definition of “Permitted Indebtedness,” (x) the purchase, defeasance or other acquisition of such Indebtedness purchased in anticipation of satisfying a sinking fund obligation, principal installment or final maturity, in each case due within one year of such purchase, defeasance or other acquisition, (y) the payment, purchase, defeasance, redemption, prepayment, decrease, acquisition or retirement of (A) any Indebtedness constituting “bridge” financing or similar Indebtedness or (B) any Acquired Indebtedness within 90 days of the acquisition of such Indebtedness or (z) the redemption, pursuant to the terms of a special mandatory redemption feature, of any Indebtedness of the Company or of any Guarantor, to the extent such Indebtedness was incurred in whole or in part to finance a transaction or Permitted Investment and either such transaction or such Permitted Investment was not consummated to the extent required pursuant to the terms of such Indebtedness); or (4) make any Investment (other than Permitted Investments): (each of the foregoing actions set forth in clauses (1), (2), (3) and (4) being referred to as a “Restricted Payment”); if at the time of such Restricted Payment or immediately after giving effect thereto: (i) a Default or an Event of Default shall have occurred and be continuing; or (ii) the aggregate amount of Restricted Payments (including such proposed Restricted Payment) made subsequent to December 14, 2010 (other than Restricted Payments made pursuant to clauses (2), (3), (4), (5), (6), (7), (8), (9), (10), (11), (12), (13) and (14) of the following paragraph) shall exceed the sum of, without duplication: (u) $400.0 million; plus (v) 50% of the cumulative Consolidated Net Income (or if cumulative Consolidated Net Income shall be a loss, minus 100% of such loss) of the Company earned subsequent to October 1, 2010 and on or prior to the date the Restricted Payment occurs (the “Reference Date”) (treating such period as a single accounting period); plus (w) 100% of the aggregate net cash proceeds (including the fair market value of property (as determined by the Company in good faith) other than cash that would constitute Marketable Securities or a Permitted Business) received by the Company from any Person (other than a Subsidiary of the Company) from the issuance and sale subsequent to December 14, 2010 and on or prior to the Reference Date of Qualified Capital Stock of the Company (other than Excluded Contributions); plus (x) without duplication of any amounts included in clause (ii)(w) above, 100% of the aggregate net cash proceeds of any equity contribution received 51

subsequent to December 14, 2010 by the Company from a holder of the Company’s Capital Stock; plus (y) the amount by which Indebtedness of the Company is reduced on the Company’s balance sheet upon the conversion or exchange subsequent to December 14, 2010 of any Indebtedness of the Company for Qualified Capital Stock of the Company (less the amount of any cash, or the fair value of any other property, distributed by the Company upon such conversion or exchange); provided, however, that the foregoing amount shall not exceed the net cash proceeds received by the Company or any Restricted Subsidiary from the sale of such Indebtedness (excluding net cash proceeds from sales to a Subsidiary of the Company or to an employee stock ownership plan or a trust established by the Company or any of its Subsidiaries for the benefit of their employees); plus (z) an amount equal to the sum of (I) 100% of the aggregate net proceeds (including the fair market value of property other than cash that would constitute Marketable Securities or a Permitted Business) received by the Company or any Restricted Subsidiary subsequent to December 14, 2010 (A) from any sale or other disposition of any Investment (other than a Permitted Investment) in any Person (including an Unrestricted Subsidiary) made by the Company and its Restricted Subsidiaries and (B) representing the return of capital or principal (excluding dividends and distributions otherwise included in Consolidated Net Income) with respect to such Investment and (II) the portion (proportionate to the Company’s equity interest in an Unrestricted Subsidiary) of the fair market value of the net assets of an Unrestricted Subsidiary at any time subsequent to December 14, 2010 such Unrestricted Subsidiary is designated a Restricted Subsidiary; provided, however, that, in the case of item (II), the foregoing sum shall not exceed, in the case of any Unrestricted Subsidiary, the amount of Investments (excluding Permitted Investments) previously made (and treated as a Restricted Payment) by the Company or any Restricted Subsidiary in such Unrestricted Subsidiary. Notwithstanding the foregoing, the provisions set forth in the immediately preceding paragraph shall not prohibit: (1) the payment of any dividend or the consummation of any irrevocable redemption within 60 days after the date of declaration of such dividend or notice of such redemption if the dividend or payment of the redemption price, as the case may be, would have been permitted on the date of declaration or notice; (2) any Restricted Payment made out of the net cash proceeds of the substantially concurrent sale of, or made by exchange for, Qualified Capital Stock of Holdings or the Company (other than Capital Stock issued or sold to a Subsidiary of the Company or an employee stock ownership plan or to a trust established by the Company or any of its Subsidiaries for the benefit of their employees and other than Designated Preferred Stock) or a substantially concurrent cash capital contribution received by the Company from its stockholders; provided, however, that the net cash proceeds from such sale or 52

taxes for such fiscal year were the Company to pay such taxes as a stand-alone taxpayer, (C) customary salary, bonus and other benefits payable to officers and employees of any direct or indirect parent company of the Company to the extent such salaries, bonuses and other benefits are attributable to the ownership or operation of the Company and the Restricted Subsidiaries, (D) general corporate overhead expenses of any direct or indirect parent company of the Company to the extent such expenses are attributable to the ownership or operation of the Company and the Restricted Subsidiaries and (E) reasonable fees and expenses incurred in connection with any unsuccessful debt or equity offering by such direct or indirect parent company of the Company; (6) repurchases of Capital Stock deemed to occur upon the exercise of stock options, warrants or other convertible or exchangeable securities if such Capital Stock represents a portion of the exercise price thereof or the withholding of a portion of such Capital Stock to pay the taxes payable on account of such exercise; (7) additional Restricted Payments in an aggregate amount not to exceed the greater of (x) $75.0 million and (y) 3.0% of the Consolidated EBITDA of the Company for the period of four fiscal quarters most recently ended more than forty-five (45) days prior to the date of determination; (8) [intentionally omitted]; (9) payments of dividends on Disqualified Capital Stock issued in compliance with Section 4.09 hereof; (10) Restricted Payments made with Net Cash Proceeds from Asset Sales remaining after application thereof as required by Section 4.10 hereof (including after the making by the Company of any Net Proceeds Offer required to be made by the Company pursuant to such Section and the application of the entire Net Proceeds Offer Amount to purchase all Notes and other Senior Secured Debt of the Company or a Restricted Subsidiary of the Company tendered therein); (11) the repayment or extension of intercompany debt that is permitted under this Indenture; (12) cash payments in lieu of fractional shares in connection with the exercise of warrants, stock options or other securities convertible into or exchangeable into Capital Stock of the Company; (13) upon occurrence of a Change of Control, and within 60 days after the completion of the Change of Control Offer pursuant to Section 4.15 hereof (including the purchase of all Notes tendered), any purchase or redemption of Obligations of the Company that are subordinate or junior in right of payment to the Notes or the Guarantees required pursuant to the terms thereof as a result of such Change of Control at a purchase or redemption price not to exceed 101% of the outstanding principal amount thereof, plus accrued and unpaid interest thereon, if any; provided, however, that (A) at the time of such purchase or redemption, no Default or Event of Default shall have occurred and be continuing (or would result therefrom) and (B) such purchase or 54

redemption is not made, directly or indirectly, from the proceeds of (or made in anticipation of) any issuance of Indebtedness by the Company or any Subsidiary; and (14) Restricted Payments that are made with Excluded Contributions. Notwithstanding any of the foregoing to the contrary, the Company and its Restricted Subsidiaries may make any Restricted Payment so long as (1) no Default or Event of Default has occurred and is continuing and (2) at the time of such Restricted Payment and after giving pro forma effect thereto, the Company’s Consolidated Fixed Charge Coverage Ratio would exceed 2.0 to 1.0; provided, however, that if, at any time the criteria set forth in the preceding clause (2) cease to be satisfied, all Restricted Payments made by the Company or any of its Restricted Subsidiaries occurring on or after the date on which such criteria ceased to be satisfied shall be required to be made, to the extent permitted thereby, in compliance with the preceding paragraphs of this covenant, and the amount available for Restricted Payments pursuant to clause (ii) of the first paragraph of this covenant on or after the date on which such criteria ceases to be satisfied shall be equal to the amount that would have been available for Restricted Payments pursuant to such clause (ii) on such date without giving effect to any Restricted Payments made through such date pursuant to and in compliance with this paragraph; provided, further, that, if the Company or any of its Restricted Subsidiaries become contractually obligated to make any Restricted Payment at the time criteria set forth in the preceding clauses (1) and (2) continues to be satisfied, then the Company or such Restricted Subsidiary, as the case may be, may continue to make such Restricted Payments, even if the criteria in such clauses (1) and (2) ceases to be satisfied at the time such Restricted Payment is actually made, notwithstanding the limitation set forth in the preceding proviso, and the amount available for Restricted Payments pursuant to clause (ii) of the first paragraph of this covenant on or after the date on which such criteria ceases to be satisfied shall be equal to the amount that would have been available for Restricted Payments pursuant to such clause (ii) on such date without giving effect to any Restricted Payments made on such date pursuant to and in compliance with this proviso. For purposes of determining compliance with this covenant, in the event that a payment or other action meets the criteria of more than one of the exceptions described in clauses (1) through (14) above, or is permitted to be made pursuant to clause (ii) of the first paragraph of this covenant (including by virtue of qualifying as a Permitted Investment), the Company will be permitted to classify such payment or other action on the date of its occurrence in any manner that complies with this covenant. Payments or other actions permitted by this covenant need not be permitted solely by reference to one provision permitting such payment or other action but may be permitted in part by one such provision and in part by one or more other provisions of this covenant permitting such payment or other action (including pursuant to any section of the definition of “Permitted Investments”). The Board of Directors of the Company may designate any Restricted Subsidiary of the Company to be an Unrestricted Subsidiary as specified in the definition of “Unrestricted Subsidiary”. For purposes of making such determination, all outstanding Investments by the Company and its Restricted Subsidiaries (except to the extent repaid in cash) in the Subsidiary so designated shall be deemed to be Restricted Payments at the time of the designation and shall reduce the amount available for Restricted Payments under the first paragraph of this 55

with all other Designated Non-cash Consideration received pursuant to this clause (c) after December 14, 2010 that is at that time outstanding, not to exceed the greater of $150 million and 5% of Total Assets at the time of the receipt of such Designated Non-cash Consideration (with the fair market value of each item of Designated Non-cash Consideration being measured at the time received and without giving effect to subsequent changes in value), shall, in each of (a), (b) and (c) above, be deemed to be cash for the purposes of this provision or for purposes of the second paragraph of this Section 4.10; and (iii) upon the consummation of an Asset Sale, the Company shall apply, or cause such Restricted Subsidiary to apply, the Net Cash Proceeds relating to such Asset Sale within 545 days of receipt thereof either (A) to prepay any Secured Debt or Indebtedness of a Restricted Subsidiary that is not a Guarantor and, in the case of any such Indebtedness under any revolving credit facility, effect a corresponding reduction in the availability under such revolving credit facility (or effect a permanent reduction in the availability under such revolving credit facility regardless of the fact that no prepayment is required in order to do so (in which case no prepayment should be required)), (B) to reinvest in Productive Assets (provided that this requirement shall be deemed satisfied if the Company or such Restricted Subsidiary, by the end of such 545-day period, has entered into a binding agreement under which it is contractually committed to reinvest in Productive Assets, and such investment is consummated within 120 days from the date on which such binding agreement is entered into, and, with respect to the amount of such investment, the reference to the 546th day after an Asset Sale in the second following sentence shall be deemed to be a reference to the 121st day after the date on which such binding agreement is entered into (but only if such 121st day occurs later than such 546th day)) or (C) a combination of prepayment and investment permitted by the foregoing clauses (iii)(A) and (iii)(B). Pending the final application of any such Net Cash Proceeds, the Company or such Restricted Subsidiary may temporarily reduce Indebtedness under a revolving credit facility, if any, or otherwise invest such Net Cash Proceeds in Cash Equivalents. On the 546th day after an Asset Sale or such earlier date, if any, as the Board of Directors of the Company or of such Restricted Subsidiary determines by Board Resolution not to apply the Net Cash Proceeds relating to such Asset Sale as set forth in clauses (iii)(A), (iii)(B) and (iii)(C) of the next preceding sentence (each, a “Net Proceeds Offer Trigger Date”), such aggregate amount of Net Cash Proceeds which have not been applied on or before such Net Proceeds Offer Trigger Date as permitted in clauses (iii)(A), (iii)(B) and (iii)(C) of the next preceding sentence (each a “Net Proceeds Offer Amount”) shall be applied by the Company or such Restricted Subsidiary to make an offer to purchase (the “Net Proceeds Offer”) on a date not less than 30 nor more than 60 days following the applicable Net Proceeds Offer Trigger Date, from all Holders and holders of any other Senior Secured Debt of the Company or a Restricted Subsidiary of the Company requiring the making of such an offer, on a pro rata basis, the maximum amount of Notes and such other Senior Secured Debt that may be purchased with the Net Proceeds Offer Amount at a price equal to 100% of their principal amount (or, in the event such other Senior Secured Debt was issued with significant original issue discount, 100% of the accreted value thereof), plus accrued and unpaid 58

interest thereon, if any, to the date of purchase (or, in respect of such other Senior Secured Debt, such lesser price, if any, as may be provided for by the terms of such Senior Secured Debt); provided, however, that if at any time any non-cash consideration (including any Designated Non-cash Consideration) received by the Company or any Restricted Subsidiary of the Company, as the case may be, in connection with any Asset Sale is converted into or sold or otherwise disposed of for cash (other than interest received with respect to any such non-cash consideration), then such conversion or disposition shall be deemed to constitute an Asset Sale hereunder, and the Net Cash Proceeds thereof shall be applied in accordance with this Section 4.10. Notwithstanding the foregoing, if a Net Proceeds Offer Amount is less than $40.0 million, the application of the Net Cash Proceeds constituting such Net Proceeds Offer Amount to a Net Proceeds Offer may be deferred until such time as such Net Proceeds Offer Amount plus the aggregate amount of all Net Proceeds Offer Amounts arising subsequent to the Net Proceeds Offer Trigger Date relating to such initial Net Proceeds Offer Amount from all Asset Sales by the Company and its Restricted Subsidiaries aggregates to at least $40.0 million, at which time the Company or such Restricted Subsidiary shall apply all Net Cash Proceeds constituting all Net Proceeds Offer Amounts that have been so deferred to make a Net Proceeds Offer (the first date the aggregate of all such deferred Net Proceeds Offer Amounts is equal to $40.0 million or more shall be deemed to be a Net Proceeds Offer Trigger Date). Notwithstanding the immediately preceding paragraph, the Company and its Restricted Subsidiaries shall be permitted to consummate an Asset Sale without complying with such paragraph to the extent that: (i) at least 75% of the consideration for such Asset Sale constitutes Productive Assets, cash, Cash Equivalents and/or Marketable Securities; and (ii) such Asset Sale is for fair market value (as determined in good faith by the Company); provided (x) that to the extent the assets that are the subject of such Asset Sale constitute Collateral, (i) any such Productive Assets shall promptly constitute Collateral and (ii) any consideration consisting of cash, Cash Equivalents and/or Marketable Securities received by the Company or any of its Restricted Subsidiaries in connection with any Asset Sale permitted to be consummated under this paragraph shall constitute Net Cash Proceeds subject to the provisions of the preceding paragraph and (y) that to the extent the assets that are the subject of such Asset Sale do not constitute Collateral, any consideration consisting of cash, Cash Equivalents and/or Marketable Securities received by the Company or any of its Restricted Subsidiaries in connection with any Asset Sale permitted to be consummated under this paragraph shall constitute Net Cash Proceeds subject to the provisions of the preceding paragraph (except that the term “Senior Debt” shall be deemed to replace in each instance in such preceding paragraph the phrase “Secured Debt” or “Senior Secured Debt”, as applicable). Notice of each Net Proceeds Offer will be sent to DTC, in the case of Global Notes, or mailed to the record Holders as shown on the register of Holders, in the case of certificated notes, within 30 days following the Net Proceeds Offer Trigger Date, with a copy to the Trustee, and shall comply with the procedures set forth in Section 3.09 hereof. To the extent that the aggregate amount of Notes and other Senior Secured Debt tendered pursuant to a Net Proceeds Offer is less than the Net Proceeds Offer Amount, the Company may use any remaining Net Proceeds Offer Amount for general corporate purposes or for any other purpose not prohibited by this Indenture. Upon completion of any such Net Proceeds Offer, the Net Proceeds Offer Amount shall be reset at zero. 59

which the Change of Control occurred, the Company must send, in the case of Global Notes, through the facilities of DTC and, in the case of certificated notes, by first class mail, a notice to the Trustee and each Holder, which notice shall govern the terms of the Change of Control Offer. Such notice shall state, among other things, the purchase date, which must be no earlier than 30 days nor later than 60 days from the date such notice is sent or mailed, other than as may be required by law (the “Change of Control Payment Date”). Holders electing to have a Note purchased pursuant to a Change of Control Offer will be required to surrender the Note, with the form entitled “Option of Holder to Elect Purchase” on the reverse of the Note completed, to the Paying Agent at the address specified in the notice prior to the close of business on the third Business Day prior to the Change of Control Payment Date. (b) On the Change of Control Payment Date, the Company shall, to the extent lawful, (1) accept for payment all Notes or portions thereof properly tendered pursuant to the Change of Control Offer, (2) deposit with the Paying Agent an amount equal to the Change of Control payment in respect of all Notes or portions thereof so tendered and (3) deliver or cause to be delivered to the applicable Trustee the Notes so accepted together with an Officers’ Certificate stating the aggregate principal amount of Notes or portions thereof being purchased by the Company. The Paying Agent shall promptly mail to each Holder of Notes so tendered the Change of Control payment for such Notes, and the Trustee shall promptly authenticate and mail or deliver (or cause to be transferred by book entry) to each Holder a new Note equal in principal amount to any unpurchased portion of the Notes surrendered, if any; provided that each such new Note will be in a principal amount of $2,000 and integral multiples of $1,000 in excess thereof. The Company shall publicly announce the results of the Change of Control Offer on or as soon as practicable after the Change of Control Payment Date. Prior to sending the notice referred to in Section 4.15(a) above, but in any event within 30 days following any Change of Control, the Company shall: (i) repay in full all Indebtedness under the Credit Facilities and all other Senior Debt the terms of which require repayment upon a Change of Control; or (ii) obtain the requisite consents under the Credit Facilities and all such other Senior Debt to permit the repurchase of the Notes as provided below. The Company’s failure to comply with the covenant described in the immediately preceding sentence shall constitute an Event of Default described in clause (c) and not in clause (b) under Section 6.01 hereof. (c) The Company shall comply with the requirements of Rule 14e-1 under the Exchange Act to the extent such laws and regulations are applicable in connection with the repurchase of Notes pursuant to a Change of Control Offer. To the extent that the Company complies with the provisions of any such securities laws or regulations, the Company shall not be deemed to have breached its obligations under this Section 4.15. (d) Notwithstanding anything to the contrary in this Section 4.15, the Company shall not be required to make a Change of Control Offer upon a Change of Control if (1) a third party makes the Change of Control Offer in the manner, at the times and otherwise in compliance with the requirements set forth in this Section 4.15 hereof and purchases all Notes validly tendered and not withdrawn under such Change of Control Offer or (2) a notice of redemption has been given pursuant to Section 3.03 hereof prior to the date on which notice of the Change of Control Offer must be sent. 62

(b) [Reserved.] (c) Each Guarantor shall not, and the Company shall not permit any such Guarantor to, consolidate or merge with or into, or sell, assign, transfer, lease, convey or otherwise dispose of, in a single transaction or series of related transactions, all or substantially all of its assets to any Person unless: (1) (except in the case of such Guarantor that has been disposed of in its entirety to another Person (other than to the Company or an Affiliate of the Company), whether through a merger, consolidation or sale of Capital Stock or through the sale of all or substantially all of its assets (such sale constituting the disposition of such Guarantor in its entirety), if in connection therewith the Company provides an Officers’ Certificate to the Trustee to the effect that the Company will comply with its obligations under Section 4.10 hereof in respect of such disposition) the resulting, surviving or transferee Person (if not such Guarantor) shall be a Person organized and validly existing under the laws of the jurisdiction under which such Guarantor was organized or under the laws of the United States of America, any State thereof or the District of Columbia, and such Person shall expressly assume, by a supplemental indenture (in form and substance satisfactory to the Trustee), executed and delivered to the Trustee, all the obligations of such Guarantor, if any, under its Guarantee and the Security Documents to which it is a party, and the performance of each applicable covenant of or obligation under the Security Documents and the Intercreditor Agreement to be performed or observed on the part of such Guarantor in its capacity as a Grantor; (2) except in the case of a merger of such Guarantor with or into the Company or another Guarantor of the Company, and except in the case of a merger entered into solely for the purpose of reincorporating such Guarantor in another jurisdiction, immediately after giving effect to such transaction and the assumption contemplated by the immediately preceding clause (c)(1) (including giving effect to any Indebtedness and Acquired Indebtedness incurred and any Lien granted in connection with or in respect of the transaction), no Default or Event of Default shall have occurred and be continuing; and (3) the Company shall have delivered to the Trustee an Officers’ Certificate and an Opinion of Counsel, each stating that such consolidation, merger, sale, assignment, transfer, lease, conveyance or other disposition and, if a supplemental indenture is required in connection with such transaction, such supplemental indenture comply with the applicable provisions of this Indenture and that all conditions precedent in this Indenture relating to such transaction have been satisfied. (d) Holdings shall not consolidate or merge with or into, or sell, assign, transfer, lease or otherwise dispose of, in a single transaction or series of related transactions, all or substantially all of its assets to any Person unless: (1) the resulting, surviving or transferee Person (if not Holdings) shall be a Person organized and validly existing under the laws of the United States of America, any State thereof or the District of Columbia, and such Person shall expressly assume, by a 67

(b) in the case of an election under Section 8.02 hereof, the Company shall have delivered to the Trustee an Opinion of Counsel in the United States of America reasonably acceptable to the Trustee confirming that (A) the Company has received from, or there has been published by, the Internal Revenue Service a ruling or (B) since the date of this Indenture, there has been a change in the applicable Federal income tax law, in either case to the effect that, and based thereon such Opinion of Counsel shall confirm that, the Holders of the outstanding Notes will not recognize income, gain or loss for Federal income tax purposes as a result of such Legal Defeasance and will be subject to Federal income tax on the same amounts, in the same manner and at the same times as would have been the case if such Legal Defeasance had not occurred; (c) in the case of an election under Section 8.03 hereof, the Company shall have delivered to the Trustee an Opinion of Counsel in the United States of America reasonably acceptable to the Trustee confirming that the Holders of the outstanding Notes will not recognize income, gain or loss for Federal income tax purposes as a result of such Covenant Defeasance and will be subject to Federal income tax on the same amounts, in the same manner and at the same times as would have been the case if such Covenant Defeasance had not occurred; (d) no Default or Event of Default shall have occurred and be continuing on the date of such deposit (other than a Default or Event of Default resulting from the incurrence of Indebtedness all or a portion of the proceeds of which will be used to defease the Notes pursuant to this Article 8 concurrently with such incurrence and the grant of a Lien to secure such Indebtedness) or, insofar as Section 6.01(f) or 6.01(g) hereof is concerned, at any time in the period ending on the 91st day after the date of deposit; (e) such Legal Defeasance or Covenant Defeasance shall not result in a breach or violation of, or constitute a default under, this Indenture (other than a Default or an Event of Default resulting from the borrowing of funds to be applied to such deposit and the grant of any Lien securing such borrowing) or any other material agreement or instrument to which the Company or any of its Subsidiaries is a party or by which the Company or any of its Subsidiaries is bound; (f) the Company shall have delivered to the Trustee an Opinion of Counsel (which may be subject to customary exceptions) to the effect that (A) the trust funds will not be subject to any rights of holders of other Senior Debt, including those rights arising under this Indenture, and (B) after the 91st day following the deposit, the trust funds will not be subject to the effect of the preference provisions of Section 547 of the United States Federal Bankruptcy Code; (g) the Company shall have delivered to the Trustee an Officers’ Certificate stating that the deposit was not made by the Company with the intent of preferring the Holders over any other creditors of the Company or with the intent of defeating, hindering, delaying or defrauding any other creditors of the Company or others; 82

It shall not be necessary for the consent of the Holders under this Section 9.02 to approve the particular form of any proposed amendment or waiver, but it shall be sufficient if such consent approves the substance thereof. After an amendment, supplement or waiver under this Section becomes effective, the Company shall mail to the Holders of Notes affected thereby a notice briefly describing the amendment, supplement or waiver. Any failure of the Company to mail such notice, or any defect therein, shall not, however, in any way impair or affect the validity of any such amended or supplemental Indenture or waiver. Subject to Sections 6.04 and 6.07 hereof, the Holders of a majority in aggregate principal amount of the Notes then outstanding voting as a single class may waive compliance in a particular instance by the Company with any provision of this Indenture or the Notes. However, without the consent of each Holder affected, an amendment or waiver under this Section 9.02 may not (with respect to any Notes held by a non-consenting Holder): (a) reduce the principal amount of Notes whose Holders must consent to an amendment, supplement or waiver; (b) reduce the principal of, or change or have the effect of changing, the fixed maturity of any Note, or change the date on which any Note may be subject to redemption or reduce the redemption price therefor; (c) reduce the rate of, or change or have the effect of changing, the time for payment of interest, including defaulted interest, on any Note; (d) waive a Default or Event of Default in the payment of principal of or premium, if any, or interest on the Notes (except a rescission of acceleration of the Notes by the Holders of at least a majority in aggregate principal amount at maturity of the then outstanding Notes and a waiver of the payment default that resulted from such acceleration); (e) make any Notes payable in money other than that stated in the Notes; (f) make any change in the provisions of this Indenture protecting the legal right of each Holder to receive payment of principal of and interest on such Note on or after the due date thereof or to bring suit to enforce such payment, or permitting Holders of a majority in principal amount of Notes to waive Defaults or Events of Default; (g) after the Company’s obligation to purchase Notes arises thereunder, amend, change or modify in any material respect the obligation of the Company to make and consummate a Change of Control Offer in the event of a Change of Control or modify any of the provisions or definitions with respect thereto after a Change of Control has occurred; (h) modify or change any provision of this Indenture or the related definitions affecting the subordination or ranking of the Notes or the Guarantees in a manner which adversely affects the Holders; or 87

duties or obligations with respect to the Collateral except those expressly set forth hereunder or in the applicable Security Documents or the Intercreditor Agreements and no implied covenants or obligations shall be read into such documents against the applicable Notes Collateral Agent. No Notes Collateral Agent will be liable for any action taken or not taken by it in the absence of its own gross negligence, willful misconduct or bad faith. Each Notes Collateral Agent will be entitled to rely upon, and will not incur any liability for relying upon, any notice, request, certificate, consent, statement, instrument, document or other writing believed by it in good faith to be genuine and to have been signed or sent by the proper person. Each Notes Collateral Agent may consult with legal counsel (who may be counsel for the Company), independent accountants and other experts selected by it, and will not be liable for any action taken or not taken by it in accordance with the advice of any such counsel, accountants or experts. Without limiting the generality of the foregoing, each Notes Collateral Agent: (i) shall not be subject to any fiduciary or other implied duties, regardless of whether an Event of Default has occurred and is continuing; (ii) shall not have any duty to take any discretionary action or exercise any discretionary powers and shall not be required to take any action that, in its opinion or the opinion of its counsel, may expose such Notes Collateral Agent to liability or that is contrary to any Security Document, the Intercreditor Agreements or applicable law; (iii) shall not have any duty to disclose, and shall not be liable for the failure to disclose, any information relating to the Company or any of its Affiliates that is communicated to or obtained by the Person serving as a Notes Collateral Agent or any of its Affiliates in any capacity; (iv) shall not be liable for any action taken or not taken by it (a) with the consent or at the request of any Applicable Collateral Agent (as defined in the Intercreditor Agreement) or (b) in the absence of its own gross negligence or willful misconduct or (c) in reliance on an Officers’ Certificate of the Company stating that such action is permitted by the terms of the Intercreditor Agreements. Each Notes Collateral Agent shall be deemed not to have knowledge of any event of default hereunder or under any series of First Lien Obligations unless and until written notice describing such event of default is received by such Notes Collateral Agent from the representative of such First Lien Obligations or Holdings or the Company; and (v) shall not be responsible for or have any duty to ascertain or inquire into (a) any statement, warranty or representation made in or in connection with the Intercreditor Agreements or any Security Document, (b) the contents of any certificate, report or other document delivered hereunder or thereunder or in connection herewith or therewith, (c) the performance or observance of any of the covenants, agreements or other terms or conditions set forth herein or therein or the occurrence of any event of default, (d) the validity, enforceability, effectiveness or genuineness of the Intercreditor Agreements, any other Security Document or any other agreement, instrument or document, or the creation, perfection or priority of any Lien purported to be created by any Security Document, (e) the existence, value or the sufficiency of any Collateral for any series of First Lien Obligations, or (f) the satisfaction of any condition set forth in 97

any operative agreements governing First Lien Obligations or any Security Document, other than to confirm receipt of items expressly required to be delivered to such Notes Collateral Agent. The use of the term “agent” herein with reference to a Notes Collateral Agent is not intended to connote any fiduciary or other implied (or express) obligations arising under agency doctrine of any applicable law other than as a “representative” as such term is used in Section 9-102(a)(72)(E) of the Uniform Commercial Code. BY ACCEPTING A NOTE EACH HOLDER WILL BE DEEMED TO HAVE IRREVOCABLY AGREED TO THE FOREGOING PROVISIONS OF THIS SECTION 12.01(a) AND SHALL BE BOUND BY THOSE AGREEMENTS TO THE FULLEST EXTENT PERMITTED BY LAW. (b) Without limiting the Intercreditor Agreements, each Notes Collateral Agent shall be subject to such directions as may be properly given in accordance with this Indenture, the Intercreditor Agreements and the Security Documents. Except as expressly required by this Indenture, the Intercreditor Agreements and the Security Documents, and in each case subject to the Intercreditor Agreements, no Notes Collateral Agent shall be obligated: (i) to act upon directions purported to be delivered to it by any other Person; (ii) to foreclose upon or otherwise enforce any Lien securing the Notes or any of the Guarantees; or (iii) to take any other action whatsoever with regard to any or all of (x) the Liens securing the Notes, (y) the Guarantees or (z) the Security Documents, or with regard to the Collateral. (c) Each Notes Collateral Agent may perform any and all of its duties and exercise its rights and powers by or through, and is authorized and empowered to appoint, one or more co-agents or sub-agents or attorneys-in-fact as it deems necessary or appropriate in connection herewith and shall not be liable for the negligence or misconduct of any such agents or attorneys-in-fact selected by it in good faith. (d) Subject to the appointment and acceptance of a successor Notes Collateral Agent as provided below, either Notes Collateral Agent may resign at any time by notifying the Company and the Trustee. Upon any such resignation, the Company shall have the right to appoint a successor; provided that, during the existence and continuation of an Event of Default pursuant to clause (a), (b), (f) or (g) of Section 6.01, the Majority Holders shall have the right to appoint a successor. If no successor shall have been so appointed by the Company (or, if applicable, the Majority Holders) and shall have accepted such appointment within 30 days after the retiring Notes Collateral Agent gives notice of its resignation, then such retiring Notes Collateral Agent may, on behalf of the Holders and the Trustee, petition at the expense of the Company a court of competent jurisdiction to appoint a successor Notes Collateral Agent. Upon the acceptance of its appointment as a Notes Collateral Agent hereunder by a successor, such successor shall succeed to and become vested with all the rights, powers, privileges and duties of the retiring Notes Collateral Agent, and the retiring Notes Collateral Agent shall be discharged 98

from its duties and obligations hereunder. The fees payable by the Company to a successor Notes Collateral Agent shall be the same as those payable to its predecessor unless otherwise agreed between the Company and such successor. After a Notes Collateral Agent’s resignation hereunder, the provisions of this Article 12 and Article 7 shall continue in effect for the benefit of such retiring Notes Collateral Agent, its sub-agents and their respective Affiliates in respect of any actions taken or omitted to be taken by any of them while acting as Notes Collateral Agent. (e) The benefits, protections and indemnities of the Trustee in Sections 7.02, 7.03 and 7.07 of this Indenture shall apply mutatis mutandi to each Notes Collateral Agent in its capacity as such, including, without limitation, the rights to receive and rely on Officers’ Certificates and Opinions of Counsel, reimbursement and indemnification; provided, that the applicable standard of care of the Notes Collateral Agents with respect to Section 7.02, 7.03 and 7.07 of this Indenture shall be gross negligence and willful misconduct. (f) Each Holder, by its acceptance of any Notes, is deemed to have consented and agreed to the terms of each Security Document, as originally in effect and as amended, supplemented or replaced from time to time in accordance with its terms or the terms of this Indenture; and authorizes and empowers the Trustee and (through the Intercreditor Agreement) each Applicable Authorized Representative and Applicable Collateral Agent (each as defined in the Intercreditor Agreement) to bind the Holders and other holders of First Lien Obligations as set forth in the applicable Security Documents and Intercreditor Agreements to which they are a party and to perform its obligations and exercise its rights and powers thereunder. Notwithstanding the foregoing, no such consent or deemed consent shall be deemed or construed to represent an amendment or waiver, in whole or in part, of any provision of this Indenture or the Notes. (g) Neither the Trustee nor the Notes Collateral Agents shall be responsible for the existence, genuineness or value of any of the Collateral or for the validity, perfection, priority or enforceability of the Liens in any of the Collateral, for the validity or sufficiency of the Collateral or any agreement or assignment contained therein, for the validity of the title of the Company or any Grantor to the Collateral, for insuring the Collateral or for the payment of taxes, charges, assessments or Liens upon the Collateral or otherwise as to the maintenance of the Collateral. (h) Beyond the exercise of reasonable care in the custody thereof, neither the Trustee nor the Notes Collateral Agents shall have any duty as to any Collateral in its possession or control or in the possession or control of any agent or bailee or any income thereon or as to preservation of rights against prior parties or any other rights pertaining thereto and neither the Trustee nor the Notes Collateral Agents shall be responsible for filing any financing or continuation statements or recording any documents or instruments in any public office at any time or times or otherwise perfecting or maintaining the perfection of any security interest in the Collateral. Each of the Trustee and the Notes Collateral Agents shall be deemed to have exercised reasonable care in the custody of the Collateral in its possession if the Collateral is accorded treatment substantially equal to that which it accords its own property and shall not be liable or responsible for any loss or diminution in the value of any of the Collateral, by reason of the act or omission of any carrier, forwarding agency or other agent or bailee selected by the Trustee or a Notes Collateral Agent in good faith. 99

IN WITNESS WHEREOF, the parties have caused this Indenture to be duly executed as of the date first written above. Very truly yours, TRANSDIGM GROUP INCORPORATED By: /s/ Xxxxxxx X. Xxxxxx Name: Xxxxxxx X. Xxxxxx Title: Chief Financial Officer TRANSDIGM INC. By: /s/ Xxxxxxx X. Xxxxxx Name: Xxxxxxx X. Xxxxxx Title: Chief Financial Officer

ACME AEROSPACE, INC. XXXXX RITE AEROSPACE, INC. AEROCONTROLEX GROUP, INC. AIRBORNE ACQUISITION, INC. AIRBORNE GLOBAL, INC. AIRBORNE HOLDINGS, INC. AIRBORNE SYSTEMS NA INC. AIRBORNE SYSTEMS NORTH AMERICA INC. AIRBORNE SYSTEMS NORTH AMERICA OF CA INC. AMSAFE GLOBAL HOLDINGS, INC. AMSAFE, INC. ANGUS ELECTRONICS CO. ARKWIN INDUSTRIES, INC. ARMTEC COUNTERMEASURES CO. ARMTEC COUNTERMEASURES TNO CO. ARMTEC DEFENSE PRODUCTS CO. AUXITROL WESTON USA, INC. AVIATION TECHNOLOGIES, INC. AVIONICS SPECIALTIES, INC. AVISTA, INCORPORATED AVTECHTYEE, INC. BETA TRANSFORMER TECHNOLOGY CORPORATION BRIDPORT HOLDINGS, INC. BRIDPORT-AIR CARRIER, INC. XXXXX AEROSPACE INC. DATA DEVICE CORPORATION XXXXX AEROSPACE, INC. ESTERLINE INTERNATIONAL COMPANY XXXXXXXXX TECHNOLOGIES CORPORATION EXTANT COMPONENTS GROUP HOLDINGS, INC. EXTANT COMPONENTS GROUP INTERMEDIATE, INC. XXXXXXXX CORPORATION HYTEK FINISHES CO. ILC HOLDINGS, INC. XXXXX CORPORATION KIRKHILL INC. KORRY ELECTRONICS CO. XXXXX HOLDING CORPORATION XXXXX INTERNATIONAL CORPORATION XXXXX TECHNOLOGY GROUP, INC. MARATHONNORCO AEROSPACE, INC. XXXXX ELECTRIC CO. XXXXXXXXX AEROSPACE DE, INC. XXXXXXXXX AEROSPACE HOLDINGS, INC. NMC GROUP, INC. NORTH HILLS SIGNAL PROCESSING CORP.

NORTH HILLS SIGNAL PROCESSING OVERSEAS CORP. NORWICH AERO PRODUCTS INC. PALOMAR PRODUCTS, INC. PEXCO AEROSPACE, INC. PNEUDRAULICS, INC. RACAL ACOUSTICS, INC. SEMCO INSTRUMENTS, INC. SHIELD RESTRAINT SYSTEMS, INC. SKANDIA, INC. XXXXXX AEROSPACE INC. TA AEROSPACE CO. TACTAIR FLUID CONTROLS, INC. TDG ESL HOLDINGS INC. TEAC AEROSPACE HOLDINGS, INC. TEAC AEROSPACE TECHNOLOGIES, INC. TEXAS ROTRONICS, INC. YOUNG & FRANKLIN INC. By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Treasurer

00000 XXXXXXXXX XXXX LLC By: Xxxxxxxxx Technologies Corporation, as its sole member BETA TRANSFORMER TECHNOLOGY LLC By: Beta Transformer Technology Corporation, as its sole member CMC ELECTRONICS AURORA LLC By: Xxxxxxxxx Technologies Corporation, as its sole member ELECTROMECH TECHNOLOGIES LLC By: XxXxxxxxx Aerospace US LLC, as its sole member By: XxXxxxxxx Aerospace DE, Inc., as its sole member ESTERLINE EUROPE COMPANY LLC By: Xxxxxxxxx Technologies Corporation, as its sole member XXXXXXXXX TECHNOLOGIES SGIP, LLC By: Xxxxxxxxx Technologies Corporation, as its sole member XXXXXXX LIVERPOOL LLC By: Young & Franklin Inc., as its sole member XXXXXXXXX AEROSPACE US LLC By: XxXxxxxxx Aerospace DE, Inc., as its sole member SCIOTEQ LLC By: TREALITY SVS LLC, as its sole member By: Esterline Europe Company LLC, as its sole member By: Xxxxxxxxx Technologies Corporation, as its sole member SYMETRICS INDUSTRIES, LLC By: Symetrics Technology Group, LLC, as its sole member By: Extant Components Group Intermediate, Inc., as its sole member SYMETRICS TECHNOLOGY GROUP, LLC By: Extant Components Group Intermediate, Inc., as its sole member TREALITY SVS LLC By: Esterline Europe Company LLC, as its sole member By: Xxxxxxxxx Technologies Corporation, as its sole member TRANSICOIL LLC By: Aviation Technologies, Inc., as its sole member By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Treasurer

AEROSONIC LLC AVIONIC INSTRUMENTS LLC BREEZE-EASTERN LLC CDA INTERCORP LLC CEF INDUSTRIES, LLC CHAMPION AEROSPACE LLC HARCOSEMCO LLC XXXXXXXXX LLC TELAIR US LLC TELAIR INTERNATIONAL LLC By: Telair US LLC, as its sole member WHIPPANY ACTUATION SYSTEMS, LLC Each By: TransDigm Inc., as its sole member By: /s/ Xxxxxxx X. Xxxxxx Name: Xxxxxxx X. Xxxxxx Title: Chief Financial Officer AIRBORNE SYSTEMS NORTH AMERICA OF NJ INC. By: /s/ Xxxxxxx X. Xxxxxx Name: Xxxxxxx X. Xxxxxx Title: Chairman of the Board and Chief Executive Officer BRIDPORT ERIE AVIATION, INC. By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Chairman of the Board and President TRANSDIGM UK HOLDINGS PLC By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Director

THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., as Trustee and the US Collateral Agent By: /s/ Xxxxxx Xxxx Name: Xxxxxx Xxxx Title: Vice President THE BANK OF NEW YORK MELLON, as the UK Collateral Agent By: /s/ Xxxxxxxx X. X’Xxxxx Name: Xxxxxxxx X. X’Xxxxx Title: Vice President

PROVISIONS RELATING TO THE NOTES 1. Definitions 1. Definitions For the purposes of this Appendix the following terms shall have the meanings indicated below: “Definitive Note” means a certificated Note bearing, if required, the restricted securities legend set forth in Section 2.3(e). “Depository” means The Depository Trust Company, its nominees and their respective successors. “Distribution Compliance Period”, with respect to any Notes, means the period of 40 consecutive days beginning on and including the later of (i) the day on which such Notes are first offered to Persons other than distributors (as defined in Regulation S under the Securities Act) in reliance on Regulation S and (ii) the issue date with respect to such Notes. “Initial Purchasers” means (1) with respect to the Initial Notes issued on the Issue Date, Xxxxxx Xxxxxxx & Co. LLC, Xxxxxxx Sachs & Co. LLC, Citigroup Global Markets Inc., X.X. Xxxxxx Securities LLC, Credit Suisse Securities (USA) LLC, KKR Capital Markets LLC, RBC Capital Markets LLC, Barclays Capital Inc., Credit Agricole Securities (USA) Inc., HSBC Securities (USA) Inc. and PNC Capital Markets LLC and (2) with respect to each issuance of Additional Notes, the Persons purchasing or underwriting such Additional Notes under the related Purchase Agreement. “Initial Notes” means $1,100,000,000 aggregate principal amount of 8.00% Senior Secured Notes due 2025 issued on the Issue Date. “Issue Date” means April 8, 2020. “Purchase Agreement” means (1) with respect to the Initial Notes issued on the Issue Date, the Purchase Agreement dated April 2, 2020, among the Company, Holdings, the Guarantors and Xxxxxx Xxxxxxx & Co. LLC and Xxxxxxx Sachs & Co. LLC, as representatives of the initial purchasers of the Notes, and (2) with respect to each issuance of Additional Notes, the purchase agreement or underwriting agreement among the Company and the Persons purchasing or underwriting such Additional Notes. “QIB” means a “qualified institutional buyer” as defined in Rule 144A. “Notes Custodian” means the Trustee, as custodian with respect to the Notes in global form, or any successor entity thereto. “Notes” means the Initial Notes and the Additional Notes, treated as a single class.

“Securities Custodian” means the custodian with respect to a Global Note (as appointed by the Depository), or any successor Person thereto and shall initially be the Trustee. 1.2 Other Definitions Defined in Term Section: “Agent Members” .................................................................... 2.1(b) “Global Notes” ......................................................................... 2.1(a) “Permanent Regulation S Global Note” ................................... 2.1(a) “Regulation S” ......................................................................... 2.1(a) “Regulation S Global Notes” ................................................... 2.1(a) “Rule 144A” ............................................................................. 2.1(a) “Rule 144A Global Note” ........................................................ 2.1(a) “Temporary Regulation S Global Note” .................................. 2.1(a) 2. The Notes. 2.1(a) Form and Dating. The Notes will be offered and sold by the Company pursuant to a Purchase Agreement. The Notes will be resold initially only to (i) QIBs in reliance on Rule 144A under the Securities Act (“Rule 144A”) and (ii) Persons other than U.S. Persons (as defined in Regulation S) in reliance on Regulation S under the Securities Act (“Regulation S”). Notes may thereafter be transferred to, among others, QIBs and purchasers in reliance on Regulation S, in each case, subject to the restrictions on transfer set forth herein. Notes initially resold pursuant to Rule 144A shall be issued initially in the form of one or more permanent global Notes in definitive, fully registered form (collectively, the “Rule 144A Global Note”) and Notes initially resold pursuant to Regulation S shall be issued initially in the form of one or more temporary global notes in fully registered form (collectively, the “Temporary Regulation S Global Note”), in each case without interest coupons and with the global notes legend and restricted notes legend set forth in Exhibit A hereto, which shall be deposited on behalf of the purchasers of the Notes represented thereby with the Notes Custodian, and registered in the name of the Depository or a nominee of the Depository, duly executed by the Company and authenticated by the Trustee as provided in this Indenture. Except as set forth in this Section 2.1(a), beneficial ownership interests in the Temporary Regulation S Global Note (x) will not be exchangeable for interests in the Rule 144A Global Note, a permanent global note (the “Permanent Regulation S Global Note” and, together with the Temporary Regulation S Global Notes, the “Regulation S Global Notes”), or any other Note prior to the expiration of the Distribution Compliance Period and (y) after the expiration of the Distribution Compliance Period, may be exchanged for interests in a Rule 144A Global Note or the Permanent Regulation S Global Note only upon certification that beneficial ownership interests in such Temporary Regulation S Global Note are owned either by non-U.S. persons or U.S. persons who purchased such interests in a transaction that did not require registration under the Securities Act. Beneficial interests in a Temporary Regulation S Global Note may be exchanged for interests in a Rule 144A Global Note if (1) such exchange occurs in connection with a transfer of Securities in compliance with Rule 144A, and (2) the transferor of the beneficial interest in such Temporary Regulation S Global Note first delivers to the Trustee a written

endorsed or accompanied by appropriate instruments of transfer, in form satisfactory to the Trustee, together with: (i) certification, in the form set forth on the reverse of the Note, that such Definitive Note is either (A) being transferred to a QIB in accordance with Rule 144A or (B) is being transferred after expiration of the Distribution Compliance Period by a Person who initially purchased such Note in reliance on Regulation S to a buyer who elects to hold its interest in such Note in the form of a beneficial interest in the Permanent Regulation S Global Note; and (ii) written instructions directing the Trustee to make, or to direct the Notes Custodian to make, an adjustment on its books and records with respect to such Rule 144A Global Note (in the case of a transfer pursuant to clause (b)(i)(A)) or Permanent Regulation S Note (in the case of a transfer pursuant to clause (b)(i)(B)) to reflect an increase in the aggregate principal amount of the Notes represented by the Rule 144A Global Note or Permanent Regulation S Global Note, as applicable, such instructions to contain information regarding the Depository account to be credited with such increase, then the Trustee shall cancel such Definitive Note and cause, or direct the Notes Custodian to cause, in accordance with the standing instructions and procedures existing between the Depository and the Notes Custodian, the aggregate principal amount of Notes represented by the Rule 144A Global Note or Permanent Regulation S Global Note, as applicable, to be increased by the aggregate principal amount of the Definitive Note to be exchanged and shall credit or cause to be credited to the account of the Person specified in such instructions a beneficial interest in the Rule 144A Global Note or Permanent Regulation S Global Note, as applicable, equal to the principal amount of the Definitive Note so canceled. If no Rule 144A Global Notes or Permanent Regulation S Global Notes, as applicable, are then outstanding, the Company shall issue, and the Trustee shall authenticate, upon written order of the Company in the form of an Officers’ Certificate, a new Rule 144A Global Note or Permanent Regulation S Global Note, as applicable, in the appropriate principal amount. (c) Transfer and Exchange of Global Notes. (i) The transfer and exchange of Global Notes or beneficial interests therein shall be effected through the Depository, in accordance with this Indenture (including applicable restrictions on transfer set forth herein, if any) and the procedures of the Depository therefor. A transferor of a beneficial interest in a Global Note shall deliver to the Registrar a written order given in accordance with the Depository’s procedures containing information regarding the participant account of the Depository to be credited with a beneficial interest in the Global Note. The Registrar shall, in accordance with such instructions, instruct the Depository to credit to the account of the Person specified in such instructions a beneficial interest in the Global Note and to debit the account of the Person making the transfer the beneficial interest in the Global Note being transferred. (ii) If the proposed transfer is a transfer of a beneficial interest in one Global Note to a beneficial interest in another Global Note, the Registrar shall reflect on its books and records the date and an increase in the principal amount of the Global Note to which such interest is being transferred in an amount equal to the principal amount of the

interest to be so transferred, and the Registrar shall reflect on its books and records the date and a corresponding decrease in the principal amount of the Global Note from which such interest is being transferred. (iii) Notwithstanding any other provisions of this Appendix (other than the provisions set forth in Section 2.4), a Global Note may not be transferred as a whole except by the Depository to a nominee of the Depository or by a nominee of the Depository to the Depository or another nominee of the Depository or by the Depository or any such nominee to a successor Depository or a nominee of such successor Depository. (iv) In the event that a Global Note is exchanged for Definitive Notes pursuant to Section 2.4 of this Appendix, such Notes may be exchanged only in accordance with such procedures as are substantially consistent with the provisions of this Section 2.3 (including the certification requirements set forth on the reverse of the Notes intended to ensure that such transfers comply with Rule 144A or Regulation S, as the case may be) and such other procedures as may from time to time be adopted by the Company. (d) Restrictions on Transfer of Temporary Regulation S Global Notes. During the Distribution Compliance Period, beneficial ownership interests in Temporary Regulation S Global Notes may be sold, pledged or transferred only (i) to the Company, (ii) in an offshore transaction in accordance with Regulation S (other than a transaction resulting in an exchange for interest in a Permanent Regulation S Global Note) or (iii) pursuant to an effective registration statement under the Act, in each case in accordance with any applicable securities laws of any state of the United States. (e) Legend. (i) Except as permitted by the following paragraphs (ii), (iii) and (iv), each Note certificate evidencing the Global Notes (and all Notes issued in exchange therefor or in substitution thereof) shall bear a legend in substantially the following form: THIS NOTE (OR ITS PREDECESSOR) WAS ORIGINALLY ISSUED IN A TRANSACTION EXEMPT FROM REGISTRATION UNDER THE UNITED STATES SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”), AND THIS NOTE MAY NOT BE OFFERED, SOLD OR OTHERWISE TRANSFERRED IN THE ABSENCE OF SUCH REGISTRATION OR AN APPLICABLE EXEMPTION THEREFROM. EACH PURCHASER OF THIS NOTE IS HEREBY NOTIFIED THAT THE SELLER OF THIS NOTE MAY BE RELYING ON THE EXEMPTION FROM THE PROVISIONS OF SECTION 5 OF THE SECURITIES ACT PROVIDED BY RULE 144A THEREUNDER. THE HOLDER OF THIS NOTE AGREES FOR THE BENEFIT OF THE COMPANY THAT (A) THIS NOTE MAY BE OFFERED, RESOLD, PLEDGED OR OTHERWISE TRANSFERRED, ONLY (I) TO THE COMPANY, (II) IN THE UNITED STATES TO A PERSON WHOM THE

SELLER REASONABLY BELIEVES IS A QUALIFIED INSTITUTIONAL BUYER (AS DEFINED IN RULE 144A UNDER THE SECURITIES ACT) IN A TRANSACTION MEETING THE REQUIREMENTS OF RULE 144A, (III) OUTSIDE THE UNITED STATES IN AN OFFSHORE TRANSACTION IN ACCORDANCE WITH RULE 904 UNDER THE SECURITIES ACT, (IV) PURSUANT TO EXEMPTION FROM REGISTRATION UNDER THE SECURITIES ACT PROVIDED BY RULE 144 THEREUNDER (IF AVAILABLE), (V) PURSUANT TO ANOTHER AVAILABLE EXEMPTION FROM REGISTRATION UNDER THE SECURITIES ACT OR (VI) PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT, IN EACH OF CASES (I) THROUGH (VI) IN ACCORDANCE WITH ANY APPLICABLE SECURITIES LAWS OF ANY STATE OF THE UNITED STATES, AND (B) THE HOLDER WILL, AND EACH SUBSEQUENT HOLDER IS REQUIRED TO, NOTIFY ANY PURCHASER OF THIS NOTE FROM IT OF THE RESALE RESTRICTIONS REFERRED TO IN (A) ABOVE. Each Definitive Note will also bear the following additional legend: IN CONNECTION WITH ANY TRANSFER, THE HOLDER WILL DELIVER TO THE REGISTRAR AND TRANSFER AGENT SUCH CERTIFICATES AND OTHER INFORMATION AS SUCH TRANSFER AGENT MAY REASONABLY REQUIRE TO CONFIRM THAT THE TRANSFER COMPLIES WITH THE FOREGOING RESTRICTIONS. (ii) Upon any sale or transfer of a Note (including any Note represented by a Global Note) pursuant to Rule 144 under the Securities Act, the Registrar shall permit the transferee thereof to exchange such Note for a certificated Note that does not bear the legend set forth above and rescind any restriction on the transfer of such Note, if the transferor thereof certifies in writing to the Registrar that such sale or transfer was made in reliance on Rule 144 (such certification to be in the form set forth on the reverse of the Note). (f) Cancellation or Adjustment of Global Note. At such time as all beneficial interests in a Global Note have either been exchanged for Definitive Notes, redeemed, purchased or canceled, such Global Note shall be returned to the Depository for cancellation or retained and canceled by the Trustee. At any time prior to such cancellation, if any beneficial interest in a Global Note is exchanged for certificated Notes, redeemed, purchased or canceled, the principal amount of Notes represented by such Global Note shall be reduced, and an adjustment shall be made on the books and records of the Trustee (if it is then the Securities Custodian) with respect to such Global Note, by the Trustee or the Securities Custodian, to reflect such reduction. (g) No Obligation of the Trustee. (i) The Trustee shall have no responsibility or obligation to any beneficial owner of a Global Note, a member of, or a participant in the Depository or other Person with

respect to the accuracy of the records of the Depository or its nominee or of any participant or member thereof, with respect to any ownership interest in the Notes or with respect to the delivery to any participant, member, beneficial owner or other Person (other than the Depository) of any notice (including any notice of redemption) or the payment of any amount, under or with respect to such Notes. All notices and communications to be given to the Holders and all payments to be made to Holders under the Notes shall be given or made only to or upon the order of the registered Holders (which shall be the Depository or its nominee in the case of a Global Note). The rights of beneficial owners in any Global Note shall be exercised only through the Depository subject to the applicable rules and procedures of the Depository. The Trustee may rely and shall be fully protected in relying upon information furnished by the Depository with respect to its members, participants and any beneficial owners. (ii) The Trustee shall have no obligation or duty to monitor, determine or inquire as to compliance with any restrictions on transfer imposed under this Indenture or under applicable law with respect to any transfer of any interest in any Note (including any transfers between or among Depository participants, members or beneficial owners in any Global Note) other than to require delivery of such certificates and other documentation or evidence as are expressly required by, and to do so if and when expressly required by, the terms of this Indenture, and to examine the same to determine substantial compliance as to form with the express requirements hereof. 2.4 Certificated Notes. (a) A Global Note deposited with the Depository or with the Trustee as custodian for the Depository pursuant to Section 2.1 shall be transferred to the beneficial owners thereof in the form of Definitive Notes in an aggregate principal amount equal to the principal amount of such Global Note, in exchange for such Global Note, only if such transfer complies with Section 2.3 hereof and (i) the Depository notifies the Company that it is unwilling or unable to continue as Depository for such Global Note or if at any time such Depository ceases to be a “clearing agency” registered under the Exchange Act and, in either case, a successor Depository is not appointed by the Company within 90 days of such notice, (ii) the Company, in its sole discretion, notifies the Trustee in writing that it elects to cause the issuance of Definitive Notes under this Indenture or (iii) an Event of Default has occurred and is continuing. (b) Any Global Note that is transferable to the beneficial owners thereof pursuant to this Section shall be surrendered by the Depository to the Trustee located at its principal corporate trust office in the Borough of Manhattan, The City of New York, to be so transferred, in whole or from time to time in part, without charge, and the Trustee shall authenticate and deliver, upon such transfer of each portion of such Global Note, an equal aggregate principal amount of Definitive Notes of authorized denominations. Any portion of a Global Note transferred pursuant to this Section shall be executed, authenticated and delivered only in denominations of $2,000 and integral multiples of $1,000 in excess thereof and registered in such names as the Depository shall direct. Any Definitive Note delivered in exchange for an interest in a Note shall, except as otherwise provided by Section 2.3(e) hereof, bear the restricted securities legend and definitive note legend set forth in Exhibit A hereto.

(c) Subject to the provisions of Section 2.4(b) hereof, the registered Holder of a Global Note shall be entitled to grant proxies and otherwise authorize any Person, including Agent Members and Persons that may hold interests through Agent Members, to take any action which a Holder is entitled to take under this Indenture or the Notes. (d) In the event of the occurrence of one of the events specified in Section 2.4(a) hereof, the Company shall promptly make available to the Trustee a reasonable supply of Definitive Notes in definitive, fully-registered form without interest coupons.

EXHIBIT A TO RULE 144A/REGULATION S APPENDIX [FORM OF FACE OF NOTE] [Global Notes Legend] UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), NEW YORK, NEW YORK, TO THE COMPANY OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC) ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN. TRANSFERS OF THIS GLOBAL NOTE SHALL BE LIMITED TO TRANSFERS IN WHOLE, BUT NOT IN PART, TO NOMINEES OF DTC OR TO A SUCCESSOR THEREOF OR SUCH SUCCESSOR’S NOMINEE, AND TRANSFERS OF PORTIONS OF THIS GLOBAL NOTE SHALL BE LIMITED TO TRANSFERS MADE IN ACCORDANCE WITH THE RESTRICTIONS SET FORTH IN THE INDENTURE REFERRED TO ON THE REVERSE HEREOF. [For Regulation S Global Note Only] UNTIL 40 DAYS AFTER THE LATER OF COMMENCEMENT OR COMPLETION OF THE OFFERING, AN OFFER OR SALE OF NOTES WITHIN THE UNITED STATES BY A DEALER (AS DEFINED IN THE U.S. SECURITIES ACT) MAY VIOLATE THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT IF SUCH OFFER OR SALE IS MADE OTHERWISE THAN IN ACCORDANCE WITH RULE 144A THEREUNDER. [Restricted Notes Legend] THIS NOTE (OR ITS PREDECESSOR) WAS ORIGINALLY ISSUED IN A TRANSACTION EXEMPT FROM REGISTRATION UNDER THE UNITED STATES SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”), AND THIS NOTE MAY NOT BE OFFERED, SOLD OR OTHERWISE TRANSFERRED IN THE ABSENCE OF SUCH REGISTRATION OR AN APPLICABLE EXEMPTION THEREFROM. EACH PURCHASER OF THIS NOTE IS HEREBY NOTIFIED THAT THE SELLER OF THIS NOTE MAY BE RELYING ON THE EXEMPTION FROM THE PROVISIONS OF SECTION 5 OF THE SECURITIES ACT PROVIDED BY RULE 144A THEREUNDER. A-1

THE HOLDER OF THIS NOTE AGREES FOR THE BENEFIT OF THE COMPANY THAT (A) THIS NOTE MAY BE OFFERED, RESOLD, PLEDGED OR OTHERWISE TRANSFERRED, ONLY (I) TO THE COMPANY, (II) IN THE UNITED STATES TO A PERSON WHOM THE SELLER REASONABLY BELIEVES IS A QUALIFIED INSTITUTIONAL BUYER (AS DEFINED IN RULE 144A UNDER THE SECURITIES ACT) IN A TRANSACTION MEETING THE REQUIREMENTS OF RULE 144A, (III) OUTSIDE THE UNITED STATES IN AN OFFSHORE TRANSACTION IN ACCORDANCE WITH RULE 904 UNDER THE SECURITIES ACT, (IV) PURSUANT TO AN EXEMPTION FROM REGISTRATION UNDER THE SECURITIES ACT PROVIDED BY RULE 144 THEREUNDER (IF AVAILABLE), (V) PURSUANT TO ANOTHER AVAILABLE EXEMPTION FROM REGISTRATION UNDER THE SECURITIES ACT OR (VI) PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT, IN EACH OF CASES (I) THROUGH (VI) IN ACCORDANCE WITH ANY APPLICABLE SECURITIES LAWS OF ANY STATE OF THE UNITED STATES, AND (B) THE HOLDER WILL, AND EACH SUBSEQUENT HOLDER IS REQUIRED TO, NOTIFY ANY PURCHASER OF THIS NOTE FROM IT OF THE RESALE RESTRICTIONS REFERRED TO IN (A) ABOVE. [Temporary Regulation S Global Note Legend] EXCEPT AS SET FORTH BELOW, BENEFICIAL OWNERSHIP INTERESTS IN THIS TEMPORARY REGULATION S GLOBAL NOTE WILL NOT BE EXCHANGEABLE FOR INTERESTS IN THE PERMANENT REGULATION S GLOBAL NOTE OR ANY OTHER SECURITY REPRESENTING AN INTEREST IN THE NOTES REPRESENTED HEREBY WHICH DO NOT CONTAIN A LEGEND CONTAINING RESTRICTIONS ON TRANSFER, UNTIL THE EXPIRATION OF THE “40-DAY DISTRIBUTION COMPLIANCE PERIOD” (WITHIN THE MEANING OF RULE 903(b)(3) OF REGULATION S UNDER THE SECURITIES ACT) AND THEN ONLY UPON CERTIFICATION IN FORM REASONABLY SATISFACTORY TO THE TRUSTEE THAT SUCH BENEFICIAL INTERESTS ARE OWNED EITHER BY NON-U.S. PERSONS OR U.S. PERSONS WHO PURCHASED SUCH INTERESTS IN A TRANSACTION THAT DID NOT REQUIRE REGISTRATION UNDER THE SECURITIES ACT. DURING SUCH 40-DAY DISTRIBUTION COMPLIANCE PERIOD, BENEFICIAL OWNERSHIP INTERESTS IN THIS TEMPORARY REGULATION S GLOBAL NOTE MAY ONLY BE SOLD, PLEDGED OR TRANSFERRED (I) TO THE COMPANY, (II) OUTSIDE THE UNITED STATES IN A TRANSACTION IN ACCORDANCE WITH RULE 904 UNDER THE SECURITIES ACT, OR (III) PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT, IN EACH OF CASES (I) THROUGH (III) IN ACCORDANCE WITH ANY APPLICABLE SECURITIES LAWS OF ANY STATE OF THE UNITED STATES. HOLDERS OF INTERESTS IN THIS TEMPORARY REGULATION S GLOBAL NOTE WILL NOTIFY ANY PURCHASER OF THIS NOTE OF THE RESALE RESTRICTIONS REFERRED TO ABOVE, IF THEN APPLICABLE. AFTER THE EXPIRATION OF THE DISTRIBUTION COMPLIANCE PERIOD, BENEFICIAL INTERESTS IN THIS TEMPORARY REGULATION S GLOBAL NOTE MAY BE EXCHANGED FOR INTERESTS IN A RULE 144A GLOBAL NOTE ONLY IF (1) SUCH EXCHANGE OCCURS IN CONNECTION WITH A TRANSFER OF THE A-2

NOTES IN COMPLIANCE WITH RULE 144A AND (2) THE TRANSFEROR OF THE REGULATION S GLOBAL NOTE FIRST DELIVERS TO THE TRUSTEE A WRITTEN CERTIFICATE (IN THE FORM ATTACHED TO THIS CERTIFICATE) TO THE EFFECT THAT THE REGULATION S GLOBAL NOTE IS BEING TRANSFERRED TO A PERSON (A) WHO THE TRANSFEROR REASONABLY BELIEVES TO BE A QUALIFIED INSTITUTIONAL BUYER WITHIN THE MEANING OF RULE 144A, (B) PURCHASING FOR ITS OWN ACCOUNT OR THE ACCOUNT OF A QUALIFIED INSTITUTIONAL BUYER IN A TRANSACTION MEETING THE REQUIREMENTS OF RULE 144A, AND (C) IN ACCORDANCE WITH ALL APPLICABLE SECURITIES LAWS OF THE STATES OF THE UNITED STATES AND OTHER JURISDICTIONS. BENEFICIAL INTEREST IN A RULE 144A GLOBAL NOTE MAY BE TRANSFERRED TO A PERSON WHO TAKES DELIVERY IN THE FORM OF AN INTEREST IN THE REGULATION S GLOBAL SECURITY, WHETHER BEFORE OR AFTER THE EXPIRATION OF THE 40-DAY DISTRIBUTION COMPLIANCE PERIOD, ONLY IF THE TRANSFEROR FIRST DELIVERS TO THE TRUSTEE A WRITTEN CERTIFICATE (IN THE FORM ATTACHED TO THIS CERTIFICATE) TO THE EFFECT THAT IF SUCH TRANSFER IS BEING MADE IN ACCORDANCE WITH RULE 903 OR 904 OF REGULATION S OR RULE 144 (IF AVAILABLE). [Definitive Notes Legend] IN CONNECTION WITH ANY TRANSFER, THE HOLDER WILL DELIVER TO THE REGISTRAR AND TRANSFER AGENT SUCH CERTIFICATES AND OTHER INFORMATION AS SUCH TRANSFER AGENT MAY REASONABLY REQUIRE TO CONFIRM THAT THE TRANSFER COMPLIES WITH THE FOREGOING RESTRICTIONS. A-3

CUSIP: ISIN: TRANSDIGM INC. No. $ 8.00% SENIOR SECURED NOTES DUE 2025 TRANSDIGM INC., a Delaware corporation, promises to pay to “Cede & Co.”, or registered assigns, the principal sum of [ ] ($[ ]) on December 15, 2025. Interest Payment Dates: April 1 and October 1. Record Dates: March 15 and September 15. Dated: [ ]. Reference is made to the further provisions of this Note contained herein, which will for all purposes have the same effect as if set forth at this place.

Dated: TRANSDIGM INC., By: Name: Title: By: Name: Title:

TRUSTEE’S CERTIFICATE OF AUTHENTICATION THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., as Trustee, certifies that this is one of the Notes referred to in the within-mentioned Indenture. By: Authorized Signatory Dated:

ASSIGNMENT FORM To assign this Note, fill in the form below: I or we assign and transfer this Note to Assignee’s Legal Name, Address, and Zip Code Assignee’s soc. sec. or tax I.D. No. and irrevocably appoint agent to transfer this Note on the books of the Company. The agent may substitute another to act for him. ___________________________________________________________ Date: ________________ Your Signature: ____________________ ___________________________________________________________ Sign exactly as your name appears on the other side of this Note. In connection with any transfer of any of the Notes evidenced by this certificate occurring prior to the expiration of the period referred to in Rule 144 under the Securities Act after the later of the date of original issuance of such Notes and the last date, if any, on which such Notes were owned by the Company or any Affiliate of the Company, the undersigned confirms that such Notes are being transferred in accordance with its terms: CHECK ONE BOX BELOW (1) to the Company; or (2) inside the United States to a “qualified institutional buyer” (as defined in Rule 144A under the Securities Act of 1933, as amended (the “Securities Act”) that purchases for its own account or for the account of a qualified institutional buyer to whom notice is given that such transfer is being made in reliance on Rule 144A, in each case pursuant to and in compliance with Rule 144A under the Securities Act; or (3) outside the United States in an offshore transaction within the meaning of Regulation S under the Securities Act in compliance with Rule 904 under the Securities Act; or (4) pursuant to the exemption from registration provided by Rule 144 under the Securities Act; or (5) pursuant to another available exemption from registration under the Securities Act; or (6) pursuant to an effective registration statement under the Securities Act;

SCHEDULE OF INCREASES OR DECREASES IN GLOBAL NOTE The following increases or decreases in this Global Note have been made: Principal amount of Signature of Amount of decrease Amount of increase this Global Note authorized officer of in Principal amount in Principal amount following such Trustee or Custodian Date of Exchange of this Global Note of this Global Note decrease or increase) for the Notes

OPTION OF HOLDER TO ELECT PURCHASE If you want to elect to have this Note purchased by the Company pursuant to Section 4.10 or 4.15 of the Indenture, check the box: If you want to elect to have only part of this Note purchased by the Company pursuant to Section 4.10 or 4.15 of the Indenture, state the amount in principal amount: $ Dated: Your Signature: (Sign exactly as your name appears on the other side of this Security.) Signature Guarantee: (Signature must be guaranteed) Signatures must be guaranteed by an “eligible guarantor institution” meeting the requirements of the Registrar, which requirements include membership or participation in the Security Transfer Agent Medallion Program (“STAMP”) or such other “signature guarantee program” as may be determined by the Registrar in addition to, or in substitution for, STAMP, all in accordance with the Securities Exchange Act of 1934, as amended.