TM 1-1520-238-23
6-432
Change 1
6.97.
MAIN ROTOR SUPPORT MAST REMOVAL/INSTALLATION – continued
c. Install 18 new nuts (6) and new PLI washers
(7).
(1) Put 18 PLI washers (7) in place by installing
washer (8), inner washer (9), outer torque
indicating washer (10), and washer (11) on
each bolt (5).
(2) Thread 18 nuts (6) on bolts (5) until nuts (6)
contact washers (11).
CAUTION
To prevent damage to nut, torque indicat-
ing washer, and bolt, do not tighten nut
after washer will not turn.
d. Inspect (QA).
e. Torque 18 nuts (6), using PLI washer torque
method.
NOTE
Inspector must be present when nuts are
being torqued.
(1) Tighten 18 nuts (6) in 1/8 turn increments in
following order: 1, 10, 6, 14, 3, 12, 8, 16, 5,
11, 18, 9, 2, 13, 4, 15, 7, and 17.
(2) Insert scriber in hole on outer torque indicat-
ing washer (10) and try to turn outer washer
(10).
NOTE
Torque is correct when outer torque indi-
cating washer will no longer turn.
(3) Continue tightening nuts (6) in 1/8 turn incre-
ments until outer washer (10) will no longer
turn.
f. Touch up bare surface of 18 PLI washers (7)
(TM 55-1500-345-23).
g. Inspect (QA).
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7
6
11
10
8
9
M04-520-3
7
5
6
11
M04-520-4
6
5
6
7
8
9
10
11
12
13
14
15
16
17
18
1
2
3
4
SCRIBE
M04-520-5
10
6
7
