CIVIL AVIATION PUBLICATIONS CAP 31 AIRCRAFT PARTS AUTHENTICITY(3)

 
2. APPROVED PARTS 
 
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 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. 
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. 
 
3.   UNAPPROVED PARTS 
 
3.1 Description
 
For the purpose of this CAP an unapproved part is a part or material intended for installation on a type certificated product/aircraft, which has been neither manufactured according to approved procedures, nor conforms to an approved type design; or it fails to conform to declared specifications or accepted industry standards (i.e. standard parts).
 
Unapproved parts include, but are not limited to:
 
(a)  Parts specified in the illustrated parts catalogues (IPC) of a type certificated aircraft, but which have been manufactured, reclaimed or reworked and then marked by an unauthorised source and provided with documents which indicate falsely that the part(s) are genuine and conform to the approved type design, or meet a particular industry standard and are offered for use as conforming with an aircraft manufacturer's authorised IPC.
 
(b)  Parts shipped directly to users by manufacturers, suppliers, or distributors who do not themselves hold appropriate production approvals for the parts, and have not been authorised to make direct shipments to users or stockists by the Type Certificate holder, who alone has production approval, e.g. production overruns. This is a particular phenomenon in the United States.
 
(c)  Parts which have not been maintained, overhauled or repaired in accordance with the requirements of approved airworthiness data and/or statutory requirements, or that have been maintained, overhauled or repaired by persons not authorised to perform and certify these functions.
 
Parts not meeting the criteria in paragraph 2 are considered to be unapproved. Any part not supported by the required documentation (see 3.2 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; 
　
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