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Page Title: General Inspection Instructions - Continued
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TM 5-4210-220-12 4-9.  GENERAL MAINTENANCE PROCEDURES - Continued 4-9.3 General Inspection Instructions - Continued k Fluorescent Penetrant Inspection - Continued After applying penetrant, the surfaces will be  cleaned  with  lukewarm  water  less  than  120  deg.  F.    (Cool  water may be used, but cleaning time will be longer).  Pressurized water spray may be used to shorten the washing cycle.  The following methods may be used to develop the parts: (1)    Wet Developer Method Parts shall be completely covered in developer by spraying or dipping.  Parts shall be dried and developed in a recirculating hot air drier for one half the penetration time. (2)    Dry Developer Method Parts must first be dried.  They dry developer shall be spread on all surfaces by dusting or by dipping the part.  Parts shall be developed for one half the penetration time. (3)    No Developer Method When no developer is used, drying and developing time shall be at least equal to penetration time to allow sufficient   bleeding   of   penetrant   from   defects.      If   additional   clarity   is   required   during   inspection   dry developer may be applied by a hand powder bulb. Following development, the part shall be inspected under black light.  Any evidence of cracks is cause for rejection.  After inspection the parts shall be cleaned with dry cleaning solvent (Item 10, Appendix E) and covered with rust preventive oil. m. Lapping Procedures (1)    Clean  the  part  with  dry  cleaning  solvent  (item  10,  Appendix  E)  and  dry  with  compressed  air.    Clean  the lapping blocks with compressed air.  Do not use a cloth or any other material for this purpose. (2)    Spread  a  good  quality  600  grit  dry  lapping  powder  on  one  of  the  lapping  blocks.    Place  the  part  to  be lapped flat on the block and, using a figure eight motion, move it back and forth across the block.  Do not press on the part, but use just enough pressure to keep the part flat on the block.  It is important that the part be kept flat on the block at all times. (3)    After each four or five passes, clean the lapping powder from the part by drawing it across a clean piece of tissue placed on a flat surface and inspect the part.  DO NOT LAP EXCESSIVELY. (4)    When the part is flat, wash it in dry cleaning solvent (item 10, Appendix E) and dry it with compressed air. (5)    Place the dry part on the second block.  After applying lapping powder, move the part lightly across the block in a figure eight motion several times to give it a smooth finish.  DO NOT LAP EXCESSIVELY.  Wash the part in dry cleaning solvent (item 10, Appendix E) again, and dry it with compressed air. (6)    Place  the  dry  part  on  the  third  block.    Do  not  use  lapping  powder  on  this  block.    Keep  the  part  flat  and move it across the block several times, using the figure eight motion.  Lapping the dry part in this manner gives it the "mirror" finish required for perfect sealing. 4-64

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