TM 55-1520-240-23-9
11-139
INSTALL YAW, THRUST, ROLL OR PITCH VISCOUS DAMPER ARMS
11-139
INITIAL SETUP
Applicable Configurations:
All
Tools:
Aircraft Mechanic’s Tool Kit, NSN 5180-00-3234692
Torque Wrench, 5 to 50 Inch-Pounds
Materials:
Pencil (E271)
Epoxy Primer (E292)
Sealant (E327)
Gloves (E184.1)
Parts:
Cotter Pin
Personnel Required:
Medium Helicopter Repairer
Inspector
References:
TM 55-1520-240-23P
Task 1-13
NOTE
Procedure is same to install yaw,
thrust, roll and pitch viscous damper
arms. Yaw damper arm is shown here.
1.
If arm (1) is a replacement slide arm on shaft (2),
arm forward and plate (3) to damper (4). Rotate
arm fully up and fully down then position arm
about mid-position. Arm shall be about 90º to
mounting surface (5) of damper. Mark position of
arm on damper. Use pencil (E271).
2.
Remove arm (1) from shaft (2).
3.
Remove setscrew (6) from plate (3) on arm (1).
4.
Align marks on arm (1) and damper (4). Slide
arm on shaft (2), plate (3) to damper (4) and arm
forward. Install washer (7) and nut (8) on shaft.
Remove marks from arm and damper.
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