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INSPECT DRIVE SHAFTING ON AIRCRAFT     (Continued) - TM-55-1520-240-23-5_49
INSPECT DRIVE SHAFTING ON AIRCRAFT     (Continued)

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 4. Check for free movement of each shock mount (7) on spacer (8).  Replace nicked, scored, or gouged spacers. 5. Check shock mounts (7) as follows: CAUTION Do not use screwdrivers to displace shaft.  They may slip and damage elastomer. a. Displace shaft in vicinity of mounts (7) laterally and vertically by hand pressure. b. While shaft assembly is displaced, inspect for tears in elastomer (9). c. Displace the shaft axially and radially by hand.  Inspect for excessive play or binding between mount bushing (10) and spacer (8). d. Any tear in elastomer (9) over  1/4 inch  long (including separation of elastomer from inner face of bushing (10)) is cause for rejection of mount.  Tears usually occur at  6 o’clock position on mount (7). e. Excessive radial movement or irregularities interfering with free axial movement between bushing (10) and spacer (8) noted during the inspection process requires removal of mount (7) and spacer for detailed inspection and measurement as follows: NOTE Measurements shall be taken at 3 locations of equal distance along length of part. (1) Spacer — Replace if OD is worn to less than  0.432 inch. (2) Mount — Replace if ID of bushing (10) is more than  0.441 inch. NOTE The following inspection is required when the drive shaft retainer nut (2) cotter pin (1) is missing. 6. Remove the affected shaft assembly from the aircraft (Task 6-2, 6-3, 6-4, or 6-21). 7. Check the torque on the retainer nut (2) in the tightening direction.  If the torque is  1500 inch-pounds or greater, replace the cotter pin (1) and reinstall the drive shaft assembly (Task 6-17, 6-18, 6-19, or 6-29). 8. If the retainer nut (2) torque is less than  1500 inch-pounds. a. Disassemble the drive shaft (Task 6-12). b. Inspect spacer (5) for wear.  Replace the spacer if length is less than  0.60 inch. c. Inspect drive splines in the adapter assembly (3) and on the drive shaft (6) for wear. Replace the shaft assembly if the spline wear step exceeds  0.005 inch. 6-32 Change 1







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