Common use of CHECKS PRIOR TO RETURN Clause in Contracts

CHECKS PRIOR TO RETURN. Immediately prior to return of the Aircraft to LESSOR, LESSEE at its expense will do each of the following: 23.8.1 Have performed, and completed, by an FAA-approved repair station, all maintenance tasks specified in LESSEE's Maintenance Program and the MPD which (a) are necessary to clear the Aircraft of all such tasks for eighteen (18) months, five thousand (5,000) hours, and three thousand (3,000) cycles from the date of return of the Aircraft, and (b) are required to be performed at lesser intervals than eighteen (18) months, five thousand (5,000) hours or three thousand (3,000) cycles (all such work collectively referred to as the "RETURN CHECK"). If a maintenance task is specific to LESSEE's Maintenance Program and not required or recommended to be performed by the MPD, then LESSEE will not be required to perform such maintenance task so long as the Return Check is performed in such a manner that clears the Aircraft of all maintenance tasks in accordance with the requirements of the preceding sentence. As part of the Return Check, all non-routine tasks generated as a result of the performance of the work included in the Return Check and any other discrepancies revealed during the Return Check must also be performed in accordance with the FAA approved procedures. LESSEE will also weigh the Aircraft. LESSEE agrees to perform during the Return Check any other work reasonably required by LESSOR (and not otherwise required under this Lease) and LESSOR will, promptly upon receipt of an invoice from LESSEE, reimburse LESSEE for such work at LESSEE's preferred customer rates. 23.8.2 Have the Aircraft in compliance with Corrosion Prevention and Control Program (CPCP) as specified in the MPD and LESSEE's Maintenance Program. 23.8.3 Remove LESSEE's exterior markings, including all exterior paint, by stripping (or, at LESSOR's option, pneumatically scuff/sanding) the paint from the fuselage, empennage, wings and Engine cowlings, and clean, reseal, refinish, prepare (including application of alodine or another corrosion inhibitor) and prime the surfaces to be painted, all in accordance with Manufacturer's and paint manufacturer's recommendations. LESSEE will then repaint the fuselage, empennage, wings and Engine cowlings in the colors and logo specified by LESSOR ; PROVIDED, HOWEVER, that LESSEE will be responsible for only paying the amount that it would cost to strip or scuff/sand (whichever is performed on the Aircraft at return) and properly paint the Aircraft in LESSEE's colors and logo and LESSOR will be responsible for the excess cost to paint the Aircraft in the next lessee's colors and logo. Such painting will be accomplished in such a manner as to result in a uniformly smooth and cosmetically acceptable aerodynamic surface. All external placards, signs and markings will be properly attached, free from damage, clean and legible. 23.8.4 Clean the exterior and interior of the Aircraft. 23.8.5 If reasonably required by LESSOR, apply touch up to paint to the interior of the Aircraft, including flight deck, and replace any missing or broken placards. 23.8.6 In accordance with Article 23.7.7, permanently repair damage to the Aircraft that exceeds Manufacturer's limits and replace any non-flush structural patch repairs installed on the Aircraft with flush-type repairs, so long as the Manufacturer or the Manufacturer's Structural Repair Manual permits flush-type repairs on the portion of the Aircraft where the non-flush structural repairs were made. 23.8.7 With LESSOR or its representatives present, perform a full and complete hot and cold section videotape borescope on each Engine and its modules in accordance with the Engine manufacturer's maintenance manual. 23.8.8 If the Engine historical and technical records and/or condition trend monitoring data of any Engine (including the APU) indicate an acceleration in the rate of deterioration in the performance of an Engine, LESSEE will correct, to LESSOR's satisfaction, such conditions which are determined to be causing such accelerated rate of deterioration. 23.8.9 With LESSOR or its representatives present, accomplish a maximum power assurance run on the Engines. LESSEE will evaluate the Engine performance and record the Engine maximum power assurance test conditions and results on the Return Acceptance Receipt. 23.8.10 LESSEE will provide evidence to LESSOR's satisfaction that the Engine historical and technical records, borescope inspection, trend monitoring and other checks specified in Article 23.

CHECKS PRIOR TO RETURN. Immediately prior to return of the Aircraft to LESSOR, LESSEE at its expense will do each of the following: 23.8.1 23.10.1 Have performed, and completed, by an FAA-approved repair station, a Return Check ("RETURN CHECK") means the accomplishment of all maintenance tasks work cards specified in LESSEE's the Maintenance Program and the MPD which (a) are necessary to clear the Aircraft of all such tasks for eighteen (18) months**Material Redacted**, five thousand (5,000) hours, and three thousand (3,000) cycles from the date of return of the Aircraft, and or (b) are required to be performed at lesser intervals than eighteen (18) months, five thousand (5,000) hours or three thousand (3,000) cycles (all such work collectively referred to as the "RETURN CHECK")**Material Redacted**. If pursuant to the then-current MPD, the performance interval for a maintenance task is specific to LESSEE's Maintenance Program and not required or recommended to be performed by the MPDshorter than every **Material Redacted**, then LESSEE such task will not also be required to perform such maintenance task so long as the Return Check is performed in such a manner that clears the Aircraft of all maintenance tasks in accordance with the requirements of the preceding sentenceperformed. As part of the Return Check, all All non-routine tasks generated as a result of the performance of the these work included in the Return Check and any other discrepancies revealed during the Return Check cards must also be performed performed. For avoidance of doubt, if the inspection interval pursuant to the then-current MPD for a particular work card only refers to one or two of the three measurement tests, then the most restrictive measurement test or tests referred to in accordance with the FAA approved proceduresthen-current MPD will be utilized in determining whether the task must be performed.). LESSEE will also weigh the Aircraft. Any discrepancies revealed during such inspection will be corrected in accordance with Manufacturer's maintenance and repair manuals or FAA-approved data. LESSEE agrees to perform during the Return Check such check any other work reasonably required by LESSOR (and not otherwise required under this Lease) and LESSOR will, promptly upon receipt of an invoice from LESSEE, will reimburse LESSEE for such work at LESSEE's preferred customer rates. 23.8.2 Have the Aircraft in compliance with Corrosion Prevention and Control Program (CPCP) as specified in the MPD and LESSEE's Maintenance Program. 23.8.3 Remove LESSEE's exterior markings, including all exterior paint, by stripping (or, at LESSOR's option, pneumatically scuff/sanding) the paint from the fuselage, empennage, wings and Engine cowlings, and clean, reseal, refinish, prepare (including application of alodine or another corrosion inhibitor) and prime the surfaces to be painted, all in accordance with Manufacturer's and paint manufacturer's recommendations. LESSEE will then repaint the fuselage, empennage, wings and Engine cowlings in the colors and logo specified by LESSOR ; PROVIDED, HOWEVER, that LESSEE will be responsible for only paying the amount that it would cost to strip or scuff/sand (whichever is performed on the Aircraft at return) and properly paint the Aircraft in LESSEE's colors and logo and LESSOR will be responsible for the excess cost to paint the Aircraft in the next lessee's colors and logo. Such painting will be accomplished in such a manner as to result in a uniformly smooth and cosmetically acceptable aerodynamic surface. All external placards, signs and markings will be properly attached, free from damage, clean and legible. 23.8.4 Clean the exterior and interior of the Aircraft. 23.8.5 If reasonably required by LESSOR, apply touch up to paint to the interior of the Aircraft, including flight deck, and replace any missing or broken placards. 23.8.6 In accordance with Article 23.7.7, permanently repair damage to the Aircraft that exceeds Manufacturer's limits and replace any non-flush structural patch repairs installed on the Aircraft with flush-type repairs, so long as the Manufacturer or the Manufacturer's Structural Repair Manual permits flush-type repairs on the portion of the Aircraft where the non-flush structural repairs were made. 23.8.7 With LESSOR or its representatives present, perform a full and complete hot and cold section videotape borescope on each Engine and its modules in accordance with the Engine manufacturer's maintenance manual. 23.8.8 If the Engine historical and technical records and/or condition trend monitoring data of any Engine (including the APU) indicate an acceleration in the rate of deterioration in the performance of an Engine, LESSEE will correct, to LESSOR's satisfaction, such conditions which are determined to be causing such accelerated rate of deterioration. 23.8.9 With LESSOR or its representatives present, accomplish a maximum power assurance run on the Engines. LESSEE will evaluate the Engine performance and record the Engine maximum power assurance test conditions and results on the Return Acceptance Receipt. 23.8.10 LESSEE will provide evidence to LESSOR's satisfaction that the Engine historical and technical records, borescope inspection, trend monitoring and other checks specified in Article 23.

CHECKS PRIOR TO RETURN. Immediately prior to return of the Aircraft to LESSOR, LESSEE at its expense will do each of the following: 23.8.1 23.10.1 Have performed, and completed, by an FAA-approved repair station, a Return Check (“RETURN CHECK”) means the accomplishment of all maintenance tasks work cards specified in LESSEE's the Maintenance Program and the MPD which (a) are necessary to clear the Aircraft of all such tasks for eighteen (18) months**Material Redacted**, five thousand (5,000) hours, and three thousand (3,000) cycles from the date of return of the Aircraft, and or (b) are required to be performed at lesser intervals than eighteen (18) months, five thousand (5,000) hours or three thousand (3,000) cycles (all such work collectively referred to as the "RETURN CHECK")**Material Redacted**. If pursuant to the then-current MPD, the performance interval for a maintenance task is specific to LESSEE's Maintenance Program and not required or recommended to be performed by the MPDshorter than every **Material Redacted**, then LESSEE such task will not also be required to perform such maintenance task so long as the Return Check is performed in such a manner that clears the Aircraft of all maintenance tasks in accordance with the requirements of the preceding sentenceperformed. As part of the Return Check, all All non-routine tasks generated as a result of the performance of the these work included in the Return Check and any other discrepancies revealed during the Return Check cards must also be performed performed. For avoidance of doubt, if the inspection interval pursuant to the then-current MPD for a particular work card only refers to one or two of the three measurement tests, then the most restrictive measurement test or tests referred to in accordance with the FAA approved proceduresthen-current MPD will be utilized in determining whether the task must be performed.). LESSEE will also weigh the Aircraft. Any discrepancies revealed during such inspection will be corrected in accordance with Manufacturer’s maintenance and repair manuals or FAA-approved data. LESSEE agrees to perform during the Return Check such check any other work reasonably required by LESSOR (and not otherwise required under this Lease) and LESSOR will, promptly upon receipt of an invoice from LESSEE, will reimburse LESSEE for such work at LESSEE's ’s preferred customer rates. 23.8.2 Have 23.10.2 Perform an internal and external corrosion inspection and correct any discrepancies in accordance with the Aircraft in compliance recommendations of Manufacturer and the Structural Repair Manual. In addition, all inspected areas will be properly treated with Corrosion Prevention and Control Program (CPCP) corrosion inhibitor as specified in the MPD and LESSEE's Maintenance Programrecommended by Manufacturer. 23.8.3 23.10.3 Remove LESSEE's ’s exterior markings, including all exterior paint, by stripping pneumatically scuff sanding (oror stripping, at LESSOR's option, pneumatically scuff/sandingif reasonably determined by LESSOR taking into account the condition of the exterior paint) the paint from the fuselage, empennage, wings empennage and Engine cowlings, and clean, reseal, refinish, prepare (including application of alodine or another corrosion inhibitor) and prime the surfaces to be painted, all in accordance with Manufacturer's ’s and paint manufacturer's ’s recommendations. LESSEE will then repaint the fuselage, empennage, wings empennage and Engine cowlings in the colors and logo specified by LESSOR ; PROVIDED, HOWEVER, that LESSEE will be responsible for only paying the amount that it would cost to strip or scuff/sand (whichever is performed on the Aircraft at return) and properly paint the Aircraft in LESSEE's colors and logo and LESSOR will be responsible for the excess cost to paint the Aircraft in the next lessee's colors and logoLESSOR. Such painting will be accomplished in such a manner as to result in a uniformly smooth and cosmetically acceptable aerodynamic surface. All external placards, signs and markings will be properly attached, free from damage, clean and legible. **Material Redacted**. 23.8.4 23.10.4 Clean the exterior and interior of the Aircraft. 23.8.5 23.10.5 If reasonably required by LESSOR, apply touch touch-up to paint to the interior of the Aircraft, including flight deck, and replace any missing missing, broken or broken illegible placards. 23.8.6 23.10.6 In accordance with Article 23.7.723.9.7, permanently repair damage to the Aircraft that exceeds Manufacturer's ’s limits and replace any non-flush structural patch repairs installed on the Aircraft with flush-type repairs, so long as the Manufacturer or the Manufacturer's Structural Repair Manual permits repairs unless a flush-type repairs on the portion of the Aircraft where the non-flush structural repairs were maderepair is unavailable. 23.8.7 23.10.7 With LESSOR or and/or its representatives present, perform a full and complete hot and cold section videotape borescope on each Engine and its modules in accordance with the Engine manufacturer's ’s maintenance manual. 23.8.8 23.10.8 If the Engine historical and technical records and/or condition trend monitoring data of any Engine (including the APU) indicate an acceleration in the rate of deterioration in the performance of an Engine, LESSEE will correct, to LESSOR's ’s reasonable satisfaction, such conditions which are determined to be causing such accelerated rate of deterioration. 23.8.9 23.10.9 With LESSOR or and/or its representatives present, accomplish a maximum power assurance run on the Engines. LESSEE will evaluate the Engine performance and record the Engine maximum power assurance test conditions and results on the Return Acceptance Receipt. 23.8.10 23.10.10 LESSEE will provide evidence to LESSOR's ’s reasonable satisfaction that the Engine historical and technical records, borescope inspection, trend monitoring and other checks specified in Article 23.10.9 do not reveal any condition which would cause the Engines or any module to be unserviceable, beyond serviceable limits or serviceable with an increased frequency of inspection or with calendar time, flight hour or flight cycle restrictions under the Engine manufacturer’s maintenance manual. LESSEE will correct any discrepancies in accordance with the guidelines set out by the Engine manufacturer which may be discovered during such inspection. 23.10.11 In the event the Engine historical and technical records, borescope inspection, trend monitoring and other checks specified in Article 23.10.9 result in a dispute regarding the conformity of an Engine with the requirements of this Article 23, LESSEE and LESSOR will consult with the Engine manufacturer and follow the Engine manufacturer’s recommendations (including the accomplishment of an Engine test cell operational check) with regard to determining if such Engine complies with the requirements of this Article 23 and the manner in which any discrepancies from the requirements of this Article 23 will be rectified. 23.10.12 If the APU historical and technical records and/or condition trend monitoring data indicate an acceleration in the rate of deterioration in the performance of the APU, LESSEE will correct, to LESSOR’s reasonable satisfaction, such conditions which are determined to be causing such accelerated rate of deterioration. 23.10.13 With LESSOR and/or its representatives present, perform a full and complete hot and cold section videotape borescope on the APU in accordance with the APU manufacturer’s procedures. LESSEE will provide evidence to LESSOR’s satisfaction that the borescope inspection does not reveal any condition which would cause the APU to be unserviceable, beyond serviceable limits or serviceable with an increased frequency of inspection or with calendar time, flight hour or flight cycle restrictions. LESSEE will correct any discrepancies in accordance with the guidelines set out by the APU manufacturer which may be discovered during such inspection.

CHECKS PRIOR TO RETURN. Immediately prior to return of the Aircraft to LESSOR, LESSEE at its expense will do each of the following: 23.8.1 24.8.1 Have performed, and completed, by an LESSEE or any other FAA-approved repair station, the next due full and complete zonal, systems and structural check ("C" or its equivalent), the corresponding lower checks ("A" and "B" or equivalent) and any other maintenance and inspections tasks, all maintenance in accordance with the then-current MPD (save only for those MPD tasks specified in LESSEE's Maintenance Program and the MPD which are (a) are necessary non-MRB tasks (as defined in the MPD) and (b) which arise from information service bulletins and/or service information letters that relate to service bulletins and/or modifications that have not been incorporated in the Aircraft), sufficient to clear the Aircraft of all such tasks for eighteen operation until the next-scheduled full and complete zonal, systems and structural check under the then-current MPD (18) months, five thousand (5,000) hours, and three thousand (3,000) cycles from the date of return of the Aircraft, and (b) are required to be performed at lesser intervals than eighteen (18) months, five thousand (5,000) hours or three thousand (3,000) cycles (all such work collectively referred to as the "RETURN CHECK"). If a maintenance task is specific to LESSEE's Maintenance Program and not required or recommended to be performed by the MPD, then LESSEE which in any event will not be required to perform such maintenance task so long as the Return Check is performed in such a manner that clears the Aircraft of all maintenance tasks in accordance with the requirements of the preceding sentence. As part of the Return Check, all non-routine tasks generated as a result of the performance of the work included in the Return Check and any other discrepancies revealed during the Return Check must also be performed in accordance with the FAA approved proceduresless than fifteen (15) months). LESSEE will also weigh the Aircraft. Any discrepancies revealed during such inspection will be corrected in accordance with Manufacturer's maintenance and repair manuals or FAA-approved data. Subject to LESSEE's capacity, resources, and technical capability, LESSEE agrees to perform during the Return Check such check any other work reasonably required by LESSOR (and not otherwise required under this Lease) and LESSOR will, promptly upon receipt of an invoice from LESSEE, will reimburse LESSEE for such work at LESSEE's preferred customer rates. 23.8.2 Have the Aircraft in compliance with Corrosion Prevention and Control Program (CPCP) as specified in the MPD and LESSEE's Maintenance Program. 23.8.3 24.8.2 Remove LESSEE's exterior markings, including all exterior paint, by stripping (or, at LESSOR's option, pneumatically scuff/sanding) the paint from the fuselage, empennage, wings and Engine cowlings, and clean, reseal, refinish, prepare (including application of alodine or another corrosion inhibitor) and prime the surfaces to be painted, all in accordance with Manufacturer's and paint manufacturer's recommendations. LESSEE will then repaint the fuselage, empennage, wings and Engine cowlings in the colors and logo specified by LESSOR ; PROVIDEDprovided, HOWEVERhowever, that if such colors and logo are substantially more complex than those of LESSEE, at LESSOR's discretion, LESSOR will either (i) pay to LESSEE will be responsible for only paying an amount equal to the amount that it would incremental cost to strip or scuff/sand (whichever is performed on of repainting the Aircraft at return) in such complex colors and properly paint logo over and above the cost of repainting the Aircraft in LESSEE's colors and logo at such time or (ii) permit LESSEE to return the Aircraft repainted white and to pay LESSOR will be responsible for an amount equal to the excess incremental cost of painting the colors and logo required by LESSOR's next operator, up to an amount equal to the amount that would have been required to paint the Aircraft in the next lesseeLESSEE's colors and logolivery. Such painting will be accomplished in such a manner as to result in a uniformly smooth and cosmetically acceptable aerodynamic surface. All external placards, signs and markings will be properly attached, free from damage, clean and legible. 23.8.4 24.8.3 Clean the exterior and interior of the Aircraft. 23.8.5 24.8.4 If reasonably required requested by LESSOR, apply touch up to paint to repaint the interior flight deck and replace placards of the Aircraft, including flight deck, and replace any missing or broken placards. 23.8.6 24.8.5 In accordance with Article 23.7.7, permanently repair damage to the Aircraft that exceeds Manufacturer's limits and replace any non-flush structural patch repairs installed on the Aircraft with flush-type repairs, so long as the repairs unless Manufacturer or the Manufacturer's Structural Repair Manual permits does not recommend a flush-type repairs on the portion of the Aircraft where the non-flush structural repairs were maderepair. 23.8.7 24.8.6 With LESSOR or its representatives present, perform a full and complete hot and cold section videotape borescope on each Engine and its modules in accordance with the Engine manufacturer's maintenance manual. 23.8.8 24.8.7 If the Engine historical and technical records and/or condition trend monitoring data of any Engine (including the APU, if such data are available) indicate an acceleration in the rate of deterioration in the performance of an Engine, LESSEE will correct, to LESSOR's satisfactionperformance, such conditions which are determined to be causing such accelerated rate of deterioration. 23.8.9 With LESSOR or its representatives present, accomplish a maximum power assurance run on the Engines. LESSEE will evaluate the Engine performance and record the Engine maximum power assurance test conditions and results on the Return Acceptance Receipt. 23.8.10 LESSEE will provide evidence to LESSOR's satisfaction that the Engine historical and technical records, borescope inspection, trend monitoring and other checks specified in will not meet the requirements of Article 23.

CHECKS PRIOR TO RETURN. Immediately prior to return of the Aircraft to LESSOR, LESSEE at its expense will do each of the following: 23.8.1 Have performed, and completed, by an LESSEE or any other FAA-approved repair station, the next due full and complete zonal, systems and structural check (“C” or its equivalent), the corresponding lower checks (“A” and “B” or equivalent) and any other maintenance and inspections tasks, all maintenance in accordance with the then-current MPD (save only for those MPD tasks specified in LESSEE's Maintenance Program and the MPD which are (a) are necessary non-MRB tasks (as defined in the MPD) and (b) which arise from information service bulletins and/or service information letters that relate to service bulletins and/or modifications that have not been incorporated in the Aircraft), sufficient to clear the Aircraft of all such tasks for eighteen operation until the next-scheduled full and complete zonal, systems and structural check under the then-current MPD (18) months, five thousand (5,000) hours, and three thousand (3,000) cycles from the date of return of the Aircraft, and (b) are required to be performed at lesser intervals than eighteen (18) months, five thousand (5,000) hours or three thousand (3,000) cycles (all such work collectively referred to as the "RETURN CHECK"). If a maintenance task is specific to LESSEE's Maintenance Program and not required or recommended to be performed by the MPD, then LESSEE which in any event will not be required to perform such maintenance task so long as the Return Check is performed in such a manner that clears the Aircraft of all maintenance tasks in accordance with the requirements of the preceding sentence. As part of the Return Check, all non-routine tasks generated as a result of the performance of the work included in the Return Check and any other discrepancies revealed during the Return Check must also be performed in accordance with the FAA approved proceduresless than fifteen (15) months). LESSEE will also weigh the Aircraft. Any discrepancies revealed during such inspection will be corrected in accordance with Manufacturer’s maintenance and repair manuals or FAA-approved data. Subject to LESSEE’s capacity, resources, and technical capability, LESSEE agrees to perform during the Return Check such check any other work reasonably required by LESSOR (and not otherwise required under this Lease) and LESSOR will, promptly upon receipt of an invoice from LESSEE, will reimburse LESSEE for such work at LESSEE's ’s preferred customer rates. 23.8.2 Have the Aircraft in compliance with Corrosion Prevention and Control Program (CPCP) as specified in the MPD and LESSEE's Maintenance Program. 23.8.3 Remove LESSEE's ’s exterior markings, including all exterior paint, by stripping (or, at LESSOR's ’s option, pneumatically scuff/sanding) the paint from the fuselage, empennage, wings and Engine cowlings, and clean, reseal, refinish, prepare (including application of alodine or another corrosion inhibitor) and prime the surfaces to be painted, all in accordance with Manufacturer's ’s and paint manufacturer's ’s recommendations. LESSEE will then repaint the fuselage, empennage, wings and Engine cowlings in the colors and logo specified by LESSOR ; PROVIDEDprovided, HOWEVERhowever, that if such colors and logo are substantially more complex than those of LESSEE, at LESSOR’s discretion, LESSOR will either (i) pay to LESSEE will be responsible for only paying an amount equal to the incremental cost of repainting the Aircraft in such complex colors and logo over and above the cost of repainting the Aircraft in LESSEE’s colors and logo at such time or (ii) permit LESSEE to return the Aircraft repainted white and to pay LESSOR an amount equal to the incremental cost of painting the colors and logo required by LESSOR’s next operator, up to an amount equal to the amount that it would cost have been required to strip or scuff/sand (whichever is performed on the Aircraft at return) and properly paint the Aircraft in LESSEE's colors and logo and LESSOR will be responsible for the excess cost to paint the Aircraft in the next lessee's colors and logo’s livery. Such painting will be accomplished in such a manner as to result in a uniformly smooth and cosmetically acceptable aerodynamic surface. All external placards, signs and markings will be properly attached, free from damage, clean and legible. 23.8.4 23.8.3 Clean the exterior and interior of the Aircraft. 23.8.5 23.8.4 If reasonably required requested by LESSOR, apply touch up to paint to repaint the interior flight deck and replace placards of the Aircraft, including flight deck, and replace any missing or broken placards. 23.8.6 23.8.5 In accordance with Article 23.7.7, permanently repair damage to the Aircraft that exceeds Manufacturer's ’s limits and replace any non-flush structural patch repairs installed on the Aircraft with flush-type repairs, so long as the repairs unless Manufacturer or the Manufacturer's Structural Repair Manual permits does not recommend a flush-type repairs on the portion of the Aircraft where the non-flush structural repairs were maderepair. 23.8.7 23.8.6 With LESSOR or its representatives present, perform a full and complete hot and cold section videotape borescope on each Engine and its modules in accordance with the Engine manufacturer's ’s maintenance manual. 23.8.8 23.8.7 If the Engine historical and technical records and/or condition trend monitoring data of any Engine (including the APU, if such data are available) indicate an acceleration in the rate of deterioration in performance, such that the performance Engine will not meet the requirements of an EngineArticle 23.9.2 in light of the Engine manufacturer’s data, LESSEE will correct, to LESSOR's ’s reasonable satisfaction, such conditions which are determined to be causing such accelerated rate of deterioration. 23.8.9 23.8.8 With LESSOR or its representatives present, accomplish a maximum power assurance run (if reasonably requested by LESSOR), acceleration and bleed valve scheduling checks on the Engines. LESSEE will evaluate the Engine performance and record the Engine maximum power assurance test conditions and results on the Return Acceptance Receipt. 23.8.10 LESSEE will provide evidence to LESSOR's satisfaction that 23.8.9 If the Engine historical and technical records, borescope inspection, trend monitoring and other checks specified in Article 23.