TM10-3930-660-34 (3) Mark all damaged areas for repair or replacement. c.  Metal Lines, Flexible Lines (Hoses) and Fittings. (1) Inspect lines for sharp kinks, cracks, bends or dents. (2) Inspect flexible lines for fraying, evidence of leakage or loose fittings or connectors. (3) Check all fittings and connectors for thread damage.  Check for hex heads that are worn or rounded by poorly fitting wrenches. (4) Mark all damaged material for repair or replacement. d.  Castings. (1) Inspect all ferrous and nonferrous castings for cracks using a magnifying glass and strong light. (2)  Refer  to  MIL-I-6866,  Inspection,  Liquid  Penetrant  Methods,  and  MIL-I-6868,  Inspection  Process,  Magnetic Particles. (3) Particularly check areas around studs, pipe plugs, threaded inserts, and sharp corners.  Replace all cracked castings. (4) Inspect machined surfaces for nicks, burrs, or raised metal.  Mark damaged areas for repair or replacement. (5) Inspect all pipe plugs, pipe plug openings, screws, and screw openings for damaged or stripped threads. (6)  Check  all  gasket  mating  surfaces,  flanges  on  housings,  and  supports  for  warpage  with  a  straightedge  or surface plate.  Inspect mating flanges for discolorations that may indicate persistent oil leakage. (7) Check all castings for conformance to applicable repair standards. e.  Bearings.  Refer to TM9-214  for  inspection  of  bearings.    Check  all  bearings  for  conformance  to  applicable  repair standards. f.  Studs.  Bolts and Screws.  Replace if threads are damaged, bent, loose or stretched. g.  Gears. NOTE When gear teeth wear limits are not established, good judgment is required to determine if gear replacement is necessary. (1) Inspect all gears for cracks using a magnifying glass and strong light.  No cracks are permissible. (2) Inspect gear teeth for wear, sharp fins, burrs, and galled or pitted surfaces. 2-21