TM 55-1520-240-23-56-10 INSPECT DRIVE SHAFTING ON AIRCRAFT (Continued) 6-10h. Cracks in plates (6). Use a 5X magnifyingglass to check. If a crack is suspected indrive shaft plate, refer to TM 1-1520-253-23.i. Nicks on inside edge of plates (6). Use apointed scribe to check.j. Cracks, nicks, scratches, or gouges in dentsin tube (2). Use a 3X to 5X magnifying glassfor inspection. If a crack is suspected in driveshaft tube, refer to TM 1-1520-253-23.NOTEVibro-engraved factory markings ontube are allowed.k. Inspect for corrosion. If found, perform Task6-10.1.2. Inspect for nicks, scratches, or gouges in tube (2)and plates (6). Repair damage (Task 6-11).3. Visually inspect tubes (2) for circumferentialscoring. Observe following limits:a. Depth after blending: 0.010 inch maximum.b. Length after blending: 2.0 inches maximum.c. Width after blending: 0.40 inch maximum.d. Minimum distance from adapter rivets is: 7inches each end.e. Minimum axial distance betweencircumferential scoring repair is 4.5 inches.f. Maximum of one circumferential scoringrepair around tube OD at any one point.Change 1 6-31
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