(b)
Cut all thin, lacy, seal material that extends beyond the normal seal material on the aluminum surfaces. 1) Be careful not to cut or loosen the bottom of the material.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
70-30-01
ALL ú ú C01 Page 202 ú Mar 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FLUORESCENT-PENETRANT INSPECTION -
__________________________________ MAINTENANCE PRACTICES
_____________________
ú1.ú General ú A. This procedure includes two tasks on how to do a fluorescent penetrant ú inspection. The first task is a portable post-emulsifiable inspection. ú The second task is a water washable inspection. ú B. CFMI recommends the operators use the portable post-emulsifiable system ú because the water washable inspection can remove the penetrant indication ú if too much water is used. ú C. It is permitted to substitute a penetrant system with a higher ú sensitivity (i.e. - substitute a level 3 or 4 for a level 2 as ú recommended) if the inspectors that do the inspection have a higher ú training, knowledge, techniques and experience in the interpretation of ú indications. The higher sensitivity level gives a higher background ú fluorescence contrast that can lead to irrelevant indications. ú ú TASK 70-40-01-202-038-C00 ú2.ú Fluorescent Penetrant Inspection (Portable Post-Emulsifiable) ú A. General ú (1) This is a post-emulsifiable fluorescent penetrant inspection process ú intended for inspections at remote locations. ú (a) Portable fluorescent penetrant inspection is a localized ú process, limited to small areas or spot inspection of specific ú areas of parts. It is not intended for normal inspection. ú (b) It is convenient to use for inspection of welded or other ú localized repair areas. ú (c) The penetrant is applied only to a local area that needs to be ú inspected. ú (2) If visible non-fluorescent color dye penetrant has been used on ú parts which are to be subsequently inspected with fluorescent ú penetrants, the contamination by the dye may prevent reliable ú fluorescent penetrant inspection. ú (3) Any color dye indications evident by white light visual inspection ú shall be considered valid indications even if not detectable by ú ultraviolet light. ú (4) Titanium alloy parts are subject to stress corrosion cracking when ú residues of halogen containing compounds remain on a part that is ú subsequently subjected to high temperatures typical of welding, heat ú treating, or engine operation. ú (a) These parts must be thoroughly cleaned with non-halogen ú compounds after exposure to any halogen containing compound to ú prevent cracking and possible failure of parts.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
70-40-01
ALL ú ú C01.1 Page 201 ú Jul 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
ú (b) When using water for processing parts made of titanium or ú titanium alloy, deionized water should be used when it is ú possible. ú (5) Make sure you obey these instructions: ú (a) Make sure the parts are clean before you start the inspection ú process. ú (b) Plug or cap all tubes or holes in parts in the area being ú inspected to prevent penetrant or other material becoming ú entrapped. ú (c) Fluorescent penetrants and developers used together in an ú inspection system should be products of one manufacturer, ú except when using solvent (non-aqueous) wet developer. It is ú permissible to use the approved solvent wet developer, ú Tracer-Tech D499C, with any product system. ú B. Equipment ú (1) Inspection Booth or Darkroom or Black Cloth Hood (for remote ú locations) which prevents excessive admission of white light ú ú
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：737-300 400 500 AMM 飞机维护手册 STANDARD PRACTICES - ENGINE(55)
