TM 1-1520-238-23
5-256.12
Change 7
5.57A.
TAIL ROTOR HUB ASSEMBLY REMOVAL/INSTALLATION (AVIM) – continued
n. Inspect (QA).
o. Level hub (6) by adjusting jack pads (27) on
uprights (7) of fixture (2).
(1) Hub must be level within 1/4 DEGREE of
horizontal measured at centerline of hub. Use
level.
CAUTION
Ensure that bearings are not twisted in
fork mounts while stretching bolt.
NOTE
When using longer bolt, ensure shank of
bolt does not protrude beyond single
washer. If shank does protrude, use addi-
tional washer under head of bolt.
p. Tighten nut (12) to stretch bolt (11) until bolt is
between 0.017 INCH and 0.028 INCH longer
than original length recorded on line 16.
(1) Hold bolt (11). Use socket and hinged handle.
(2) Tighten nut (12) until bolt (11) is between
0.017 INCH and 0.028 INCH longer than orig-
inal length. Use socket, adapter supplied in
centering kit, 16-inch extension, torque
wrench, and caliper.
(a) Bolt (11) must protrude 0.083 INCH mini-
mum, including chamfer, through nut
(12). Use caliper.
(b) If bolt (11) does not protrude a minimum
of 0.083 INCH, including chamfer, re-
place bolt (11) with longer bolt.
(3) If bolt was elongated to 0.033 INCH or great-
er, remove and discard bolt (11) and nut (12).
Repeat steps k. through p.
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M04-3245-18
2
7
27
6
12
24
28
11
VIEW ROTATED
LEVEL
27
23
