TM 1-1520-238-23
6-39
6.8.
NO. 4 TAIL ROTOR DRIVE SHAFT, DAMPER, AND ANTI-FLAIL SUPPORT
REMOVAL/INSTALLATION – continued
c. Check drive shaft for nicks, dents, or scratches (para 6.1).
d. Check drive shaft for loose or damaged nutplates (para 6.1).
NOTE
The following inspection procedures apply to aft hanger bearing coupling flange.
e. Check for cracks. None allowed.
f. Check for nicks or scratches (para 6.1).
g. Check for elongated bolt holes, bends, or abrasions (para 6.1).
NOTE
Unless otherwise specified, the following inspection procedures apply to both damper and anti-flail sup-
port.
h. Check for nicks, dents, or scratches (para 6.1).
i. Check for loose or damaged nutplates (para 6.1).
j. Check damper support for cracks.
(1) Cracks or tears more than 25 percent of shortest dimension are not acceptable.
(2) Cracks on holes more than 3.0 INCHES diameter with cleanup more than 2.0 INCHES from supporting
structure and affecting more than 5 percent of skin area are not acceptable.
(3) Check damper support bracket for cracks. None allowed. Replace bracket(s) (para 6.8.7).
k. Check anti-flail support for cracks.
(1) Check anti-flail support sleeve for cracks. None allowed. Replace sleeve (para 6.8.7).
(2) Check anti-flail support doublers for cracks. None allowed. Replace doubler (para 6.8.7).
(3) Check anti-flail support bracket for cracks. None allowed. Replace bracket(s) (para 6.8.7).
l. Check for cracks elsewhere on damper and anti-flail support.
(1) Refer to paragraph 6.8.7 to determine if location and/or size of crack is acceptable, and appropriate repair
procedures.
m. Check anti-flail support sleeves for other evidence of damage. Replace sleeve (para 6.8.7).
n. Check anti-flail support doublers for debonding and elongated bolt holes. Replace doubler (para 6.8.7).
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