TM 1-1520-238-23
Change 7
5-256.13
5.57A.
TAIL ROTOR HUB ASSEMBLY REMOVAL/INSTALLATION (AVIM) – continued
(4) If bolt (11) has been elongated between
0.028 to 0.032 INCH, or bearing (28) has
been twisted in fork mounts (23) or (24), re-
move nut (12) from bolt (11).
(a) After 15 MINUTES, remeasure bolt (11)
to assure bolt has returned to original
length recorded on line 16.
(b) If bolt (11) has not returned to original
length, remove and discard bolt (11) and
nut (12). Repeat steps k. through p.
(5) Apply corrosion preventive compound to
head of bolt (11), exposed areas of bolt (11)
where it passes through hub (6), nut (12), and
exposed threads of bolt (11). Use corrosion
preventive compound (item 62, App F).
q. Measure gap between hub (6) and mounts (23)
and (24). Use thickness gage.
(1) Measurement should be no less than 0.018
INCH.
r. Inspect (QA).
NOTE
All bolt measurements must be taken at
the same points at each end of bolts.
Points should be marked with a wax pen-
cil.
s. Measure and record length of new bolt (11).
Use height gage.
(1) Record bolt (11) length on line 16.
t. Apply an even coat of lubricant on bolt (11),
new washers (13), (14), and new nut (12). Use
lubricant (item 114, App F).
(1) Allow lubricated hardware to cure for 6
HOURS at room temperature, or air dry for 30
MINUTES and then cure for 30 MINUTES at
150 F (66 C).
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14
0.018
6
23
0.018
M04-3245-22
11
24
12
13
