NMWR-9-2815-220 Overhaul Manual for M60 M88 Engine AVDS-1790-2CA, AVDS-1790-2DA, AVDS-1790-2DR Download
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NMWR 9-2815-220 GENERAL MAINTENANCE, OVERHAUL, AND REPAIR PROCEDURES—Continued 0005 00 DIAGNOSTIC AND AUTOMATED TEST EQUIPMENT - Continued 2. Liquid Penetrant Inspection. a. General. Liquid penetrant inspection is a nondestructive test for faults open to the surface in parts made of any nonporous material. With penetrant inspection, detectable defects such as surface cracks, porosity, and through leaks may be found. Penetrant inspection is used on such metals as aluminum, magnesium, brass, copper, and nonmagnetic alloys. NOTE Penetrant inspection may be used on iron, steel, and steel alloys, but magnetic particle inspection is preferred on magnetic materials. The chief limitation of penetrant inspection is that the defect must be open to the surface. b. Personnel. Inspection personnel performing liquid penetrant inspection shall be qualified and certified in accordance with NAS410(2). c. Materials and Equipment. The best results can be obtained with penetrant inspection only when the proper materials and adequate equipment are used and approved techniques are employed. (1) Liquid penetrant inspection shall be of the following types and methods as specified in ASTM-E-1417. Type I – Fluorescent Method A – Water washable Method B – Post emulsified Method C – Solvent removed Type I – Visible Dye Method A – Water washable Method B – Post emulsified Method C – Solvent removed CAUTION Compliance with the family concept for materials as noted in SAE-AMS2644D is mandatory. This means that items from different manufacturers cannot be mixed in any one group or method of inspection. (2) Only materials conforming to and qualified under SAE-AMS2644D shall be used for liquid penetrant inspection. (3) Fluorescent inspection units shall conform to ASTM-E-1417. (4) Visible penetrant inspection equipment shall be suitable for processing in accordance with ASTM-E- 1417. (5) Selection of types and methods of liquid penetrant inspection will be as stated in ASTM-E-1417. 0005 00-17 Change 1