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
