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INSPECT DRIVE  SHAFTING ON AIRCRAFT (Continued)
INSPECT DRIVE SHAFTING ON AIRCRAFT     (Continued) - TM-55-1520-240-23-5_50

TM-55-1520-240-23-5 CH-47D Heilcopter Manual
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TM 55-1520-240-23-5 6-10 INSPECT DRIVE SHAFTING ON AIRCRAFT     (Continued) 6-10 h. Cracks in plates (6).  Use a  5X  magnifying glass to check.  If a crack is suspected in drive shaft plate, refer to TM 1-1520-253-23. i. Nicks on inside edge of plates (6).  Use a pointed scribe to check. j. Cracks, nicks, scratches, or gouges in dents in tube (2). Use a  3X to 5X  magnifying glass for inspection. If a crack is suspected in drive shaft tube, refer to TM 1-1520-253-23. NOTE Vibro-engraved factory markings on tube are allowed. k. Inspect for corrosion.  If found, perform Task 6-10.1. 2. Inspect for nicks, scratches, or gouges in tube (2) and plates (6).  Repair damage (Task 6-11). 3. Visually inspect tubes (2) for circumferential scoring.  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:  7 inches  each end. e. Minimum  axial  distance  between circumferential scoring repair is  4.5 inches. f. Maximum of one circumferential scoring repair around tube OD at any one point. Change 1 6-31







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