(b)
components that do not meet design specifications, and cannot be brought into conformity with such specifications;
(c)
components subjected to unacceptable modification or rework that is irreversible;
(d)
certified life-limited parts that have reached or exceeded their certified life limits, or have missing or incomplete records;
(e)
components that cannot be returned to airworthy condition due to exposure to extreme forces, heat or adverse environment;
(f)
components for which conformity with an applicable airworthiness directive cannot be accomplished;
(g)
components for which continuing airworthiness records and/or traceability to the manufacturer can not be retrieved.
2. It is common practice for possessors of aircraft components to dispose of unsalvageable components by selling, discarding, or transferring such items. In some instances, these items have reappeared for sale and in the active parts inventories of the aviation community. Misrepresentation of the status of components and the practice of making such items appear serviceable has resulted in the use of unsalvageable nonconforming components. Therefore organisations disposing of unsalvageable aircraft components should consider the possibility of such components later being misrepresented and sold as serviceable components. Caution should be exercised to ensure that unsalvageable components are disposed of in a manner that doesnot allow them to be returned to service.
AMC M.504 (d) 2 - Control of unserviceable components
1.
Mutilation should be accomplished in such a manner that the components become permanently unusable for their original intended use. Mutilated components should not be able to be reworked or camouflaged to provide the appearance of being serviceable, such as by re-plating, shortening and re-threading long bolts, welding, straightening, machining, cleaning, polishing, or repainting.
2.
Mutilation may be accomplished by one or a combination of the following procedures:
(a)
grinding,
(b)
burning,
(c)
removal of a major lug or other integral feature,
(d)
permanent distortion of parts,
(e)
cutting a hole with cutting torch or saw,
(f)
melting,
(g)
sawing into many small pieces,
(h)
any other method accepted by CAD on a case by case basis.
3. The following procedures are examples of mutilation that are often less successful because they may not be consistently effective:
(a)
stamping or vibro-etching,
(b)
spraying with paint,
(c)
small distortions, incisions or hammer marks,
(d)
identification by tag or markings,
(e)
drilling small holes,
(f)
sawing in two pieces only.
4. Since manufacturers producing approved aircraft components should maintain records of serial numbers for "retired" certified life-limited or other critical components, the organisation that mutilates a component should provide the original manufacturer with the data plate and/or serial number and final disposition of the component.
AMC M.504 (e) - Control of unserviceable components
A maintenance organisation may choose, in agreement with the component’s owner, to release an unsalvageable component for legitimate non-flight uses, such as for training and education, research and development. In such instances, mutilation may not be appropriate. The following methods should be used to prevent the component re-entering the aviation supply system:
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