Lifecycle Coverage - Parts. Termination Notice (PTN) STEP-G is obliged to deliver spare parts to its customers after the end of mass production of the customer's products of STEP-G. In the case of delivered customer-specific contract products (contract product with specification originating in STEP-G or for which STEP-G holds the exclusive rights), a lifetime supply (series and aftermarket requirements) must be ensured by the SUPPLIER in accordance with the contractual agreements. In the event of unavoidable termination of the standard contract product (contract product with a specification originating in SUPPLIER that is not in the standard warehouse and/or standard portfolio of the SUPPLIER), the SUPPLIER shall send a written notice of termination of parts to STEP-G for at least 24 months prior to such a planned termination. All affected part numbers/contract products of STEP-G are to be identified with the PTN. The SUPPLIER will indicate alternative products/solutions for replacement and determine the necessary storage and handling methods in case the PTN lead to a final purchase by STEP-G. The PTN must be in writing. This must be sent by the SUPPLIER either by e-mail or by letter to the purchasing department of STEP-G.