31 July 2011 C1 CIVIL AVIATION DEPARTMENT HONG KONG ...

3.6 Parts that cannot be returned to an airworthy condition due to exposure toextreme forces or heat. (See Airworthiness Notice No.97)3.7 Principal Structural Elements (PSE) removed from a high-cycle aircraft forwhich conformity cannot be accomplished by complying with the mandatoryrequirements applicable to ageing aircraft.4 Methods to Prevent Misrepresentation of Scrap Parts and Materials4.1 Persons disposing of scrap aircraft parts and materials should, whenappropriate, mutilate those parts and materials prior to release. Mutilationshould be accomplished in such a manner that the parts become unusable fortheir original intended use, nor should they be able to be reworked orcamouflaged to provide the appearance of being serviceable, such as by replating,shortening and re-threading long bolts, welding, straightening,machining, cleaning, polishing, or repainting.4.1.1 Mutilation may be accomplished by one or a combination of thefollowing procedures, but is not limited to:-(a)(b)(c)(d)(e)(f)(g)Grinding;Burning;Removal of a major lug or other integral feature;Permanent distortion of parts;Cutting a hole with cutting torch or saw;Melting;Sawing into many small pieces.4.1.2 The following procedures are examples of mutilation that are often lesssuccessful because they may not be consistently effective:-(a)(b)(c)(d)(e)(f)Stamping (such as a stamped 'R' on a part);Spraying with paint;Hammer marks;Identification by tag or markings;Drilling small holes;Sawing in two pieces. Persons who rework scrap parts andmaterials may be skilled technicians and attempt to restore partscut in two pieces in such a manner that the mutilation provesdifficult to detect.4.2 Persons disposing of scrap aircraft parts and materials for legitimate non-flightuses, such as training and education aids, research and development, or for nonaviationapplications. In such instances, mutilation is not appropriate and thefollowing methods should be used to prevent misrepresentation:-4.2.1 Permanently marking or stamping the parts, subparts, and material as31 January 2002 AN-96 P.2