TM 5-4310-451-145-7. INSPECTION INSTRUCTIONS (Con’t).h.Inspect shaft splines for wear, pitting, rolling, peening, and fatigue cracks.i.Inspect gears for the following:(1)Worn or broken teeth. Wear must not prevent gears from meshing or performing properly.(2)Scoring or burrs on face of gears. Remove defects with soft stone, then clean thoroughly. If scoringor burrs cannot be removed with soft stone, replace gear.(3)Chipped and burred splines. Remove burrs with soft stone, then clean thoroughly. Spline wear is notconsidered cause for part replacement.(4)Burning indicated by discoloration and loss of hardness due to excessive heat.J.Perform a fluorescent penetrant inspection of steel parts which are not easily replaced, of steel parts whichhave been reworked or reground, and of parts containing areas where fatigue can be expected. The following procedureshould be followed when performing fluorescent penetrant Inspection:(1)Clean and warm parts before applying penetrant. A vapor degreaser may be used as necessary toclean part.(2)Apply penetrant to all surfaces to be examined by dipping, painting, or spraying. Penetration time forvarious metals are as follows:(a)Aluminum Alloy - no less than 20 minutes.(b)Magnesium Alloy - no less than 20 minutes.(c)Brass or Bronze - no less than 30 minutes.(d)Ferrous Alloys - no less than 60 minutes.(3)Clean penetrant from all surfaces using slightly warm water. Water must be no warmer than 1200 F(490C) to prevent removal of penetrant from cracks. Cool water may be used when necessary, but cleaning time will belonger. Pressurized water spray may be used to shorten the washing cycle.(4)Dry and develop parts using one of the following methods:(a)Wet Developer Method. Cover parts completely with developer by spraying or dipping. Dry partsand develop in a recirculating hot air dryer for one-half the penetration time.(b)Dry Developer Method. Dry parts completely. Cover all surfaces with developing powder by dippingor dusting. Develop parts for one-half the penetration time.(c)No Developer Method. Drying and developing time must be at least equal to the penetration time toallow for sufficient bleeding of penetrant from the defects. Dry developer may be used as necessary for additional clarityduring inspection by applying to questionable areas with a hand powder bulb.(5)Inspect parts for cracks under black light. If cracks are evident, replacement of part is required.(6)Clean parts thoroughly with dry cleaning solvent (Item 38, Appendix E) and lubricate with preservativeoil (Item 29, Appendix E).5-8
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