TM 55-1520-240-23-5 6-10.1 CLEAN AND INSPECT DRIVE SHAFTING OFF AIRCRAFT     (Continued) 6-10.1 NOTE Inspect all drive shafts in the same way.  Typical shaft shown. Rotate shaft as needed to complete check. Tube and adapter are balanced together.  If one is damaged, both must be replaced. 1. Inspect shaft (1) for damage listed below.  There shall be no such damage. a. Cracks in tube (2). b. Dents in tube (2) more than  1 inch  diameter or  0.040 inch  deep. c. Distance between any two dents less than 4.5 inches. d. More than one dent around tube (2) at any one point. e. Distance between end flange (3) and any dent less than  1.25 inches. f. Loose or cracked rivets (4) at ends of tube. NOTE Adapters have a shotpeened surface. Damage cannot be repaired. g. Cracks, nicks, scratches, or gouges in adapter (5).  Use a  5X  magnifying glass to check. h. Cracks in plates (6).  Use  5X  magnifying glass to check. 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 Fluorescent Inspection to check (TM 1-1500-335-23). k. Inspect for corrosion. If no corrosion is found, perform only steps 2 and 3. NOTE Vibro-engraved factory markings on tube are allowed. 2. Inspect for nicks, scratches, or gouges in tube (2) or 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 repairs is  4.5 inches. f. Maximum of one circumferential scoring repair around tube outer diameter (OD) at any one point. Change 1 6-35