CIVIL AVIATION PUBLICATIONS CAP 31 AIRCRAFT PARTS AUTHENTICITY(4)

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(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. 
 
 
 
3.2   Supporting Documentation 
 
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. 
 
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. 
 
3.3  Precautions to Prevent the Inadvertent Acceptance of Unapproved Parts 
 
Documentary evidence of compliance with an approved process will not in itself provide a guarantee against the installation of unapproved parts if the original supplier of such parts knowingly provides false information or otherwise sets out to deceive. It is always necessary to have secondary defences in place designed to give early warning of unapproved parts prior to their release for installation. 
 
The primary defence in such cases is a strong, well-informed and alert parts ordering and receiving system which, through auditing and reports, establishes a satisfactory level of confidence in its parts suppliers and which: 
 
(a)  ensures a continual correlation between parts ordered and parts received; 
 
(b)  is alert to any unauthorized alterations to supporting documentation and to any inability of the supplier to supply the required documentation; 
 
(c)  is aware if a quoted price for the part is significantly lower than that quoted by other suppliers;
 
(d)  is aware that delivery times are significantly shorter than those quoted by other suppliers; and 
　
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