TM 55-1520-240-23-4
5-9.1
ROTARY-WING HEAD RETAINING NUT TORQUE CHECK
(Continued)
5-9.1
15.
Install tang washer (7) on nut (9).
Do not file tang washer to make it
fit. Filing can cause tangs to break
causing loss of helicopter and loss
of life.
16.
If nut (9) moved during torque check and tang
washer (7) cannot be seated in any position,
repeat steps 6 thru 15. Increase/vary torque
upward accordingly, not to exceed 6000
foot-pounds to seat tang washer (7).
17.
Install retaining ring (6) in groove of nut (9).
INSPECT
18.
Install packing (5) on hub oil tank (13).
19.
Position cover (4) on hub oil tank (13).
20.
Position retainer (3) on cover (4). Install nine
screws (1) and washers (2). Torque screws to
23 inch-pounds.
INSPECT
FOLLOW-ON MAINTENANCE:
Close forward or aft work platforms (Task 2-2).
Remove tiedown lines from forward and aft blades.
END OF TASK
5-73
