TM 55-1520-240-23-9
11-138
REMOVE YAW, THRUST, ROLL OR PITCH VISCOUS DAMPER ARMS
11-138
INITIAL SETUP
Applicable Configurations:
All
Tools:
Aircraft Mechanic’s Tool Kit, NSN 5180-00-323-4692
Materials:
Pencil (E271)
Personnel Required:
Medium Helicopter Repairer
References:
TM 1-1520-253-23
Equipment Condition:
Battery Disconnected (Task 1-39)
Electrical Power Off
Hydraulic Power Off
Closet Acoustic Blanket Removed (Task 2-107)
Closet Backup Panel Removed (Task 2-2)
NOTE
Procedure is same to remove yaw,
thrust, roll, or pitch viscous damper
arms. Yaw damper arm is shown here.
NOTE
If a crack in the connecting link is
suspected during removal, refer to TM
1-1520-253-23.
1.
Remove cotter pin (1), nut (2), two washers (3),
and bolt (4) from link (5). Disconnect damper
arm (6). Rotate arm up.
2.
Install bolt (4), two washers (3), and nut (2),
loosely in link (5).
3.
Mark position of arm (6) on damper (7). Use
pencil (E271).
4.
Remove nut (8) and washer (9) from shaft (10).
5.
Loosen setscrew (11) in arm (6). Slide arm from
shaft (10).
FOLLOW-ON MAINTENANCE:
None
END OF TASK
11-602
