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4.4.5.2.3.2  Whenever an AD has been complied with by an AME, the AME should not only record the date of compliance and time in service in the aircraft maintenance records, but also furnish a description of the work done — several alternative methods of compliance may be possible, and at some later date it may be important to know which route was followed. Before the aircraft goes back into service, whoever accepts it from the shop should first determine that the maintenance record, including ADs, is fully up to date.
4.4.5.2.3.3 The responsibility for compliance with ADs cannot be disclaimed by any of the parties involved in its operation or maintenance, namely the AME, maintenance organization, owner or operator. All have some degree of responsibility, depending always upon the circumstances under which the aircraft is used; all are expected to know about the procedures for issuing ADs, and to understand their role in compliance.
4.5 Authenticity and serviceability of aircraft parts
4.5.1  Introduction
4.5.1.1 The need to ensure that parts installed on an aircraft meet the design specification and are serviceable is self-evident. The installation of any part failing to meet the intended design requirements degrades those requirements, leading to a degradation of airworthiness.
4.5.1.2  It is essential that for the purposes of continuing airworthiness a system of control exists which ensures that only parts meeting the approved design data applicable to a particular aircraft are installed on that aircraft. This chapter provides guidance on the establishment of such a system.
4.5.2  Approved parts
4.5.2.1  An approved part is one whose design has been found to be acceptable to the State of Design, whose proper manufacture has been approved by the State of Registry, and that has been found to be in a condition for safe operation by the State of Registry.
Note.— Parts approved pursuant to 4.5.2.1 above are eligible for installation on a specific aircraft if, and only if, they also meet the approved design data applicable to the particular aircraft they are to be installed on. For example, a seat designed and approved for 9 g forward loads is not eligible for installation on an aircraft which is required to have a seat that is dynamically tested for 16 g.
4.5.2.2 Standard parts such as fasteners are considered as approved parts when they are in compliance with a national or industry accepted standard and when referenced in the type design of the particular aircraft.
4.5.3  Unapproved parts
Parts not meeting the criteria described in 4.5.2.1 and 4.5.2.2 above are considered to be unapproved. Any part not supported by the required documentation (see 4.5.4 below) would also be considered to be unapproved. Unapproved parts also include those parts improperly returned to service, for example:
a)  parts supplied directly to the end user by a subcontractor without direct ship authority from the design approval holder and the State of Manufacture to do so;
b)  parts maintained or approved for return to service by a person or organization not approved to do so;
c)  parts not maintained in accordance with the requirements of the applicable approved data; and
d)  parts having reaching their life limit, including, if applicable, any shelf-life limit.
4.5.4  Supporting documentation
4.5.4.1 A documentation process providing written evidence of the acceptability of a part is an essential element of any system designed to ensure that only approved parts are installed on an aircraft. Such a process is intended to provide all relevant information concerning the part to which it refers sufficient to enable a potential installer to readily ascertain its status.
4.5.4.2   Such documents will contain information relating to: a) the authority under which it is issued; b) reference identification for the purposes of traceability; c) name, address and approval reference of the issuing organization; d) work order, contract or invoice number; e) quantity, description, part number and, if applicable, serial number of the part; f) relevant information concerning any life limitations, including in-service history records; g) the signature and approval reference of the person issuing the document; and h) whether the part is new or used.
　
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