TM 55-1520-240-23-9
11-133
ADJUST THRUST BALANCE SPRING
11-133
INITIAL SETUP
Applicable Configurations:
All
Tools:
Aircraft Mechanic’s Tool Kit, NSN 5180-00-323-4692
Dial Indicating Scale, 0 to 50 Pounds
Materials:
Straps (E376)
Personnel Required:
CH-47 Helicopter Repairer
Inspector
Equipment Condition:
Thrust Brake Circuit Breaker Open (TM
55-1520-240-T)
Battery Connected (Task 1-39)
Electrical Power On
Hydraulic Power On
Closet Acoustic Blanket Removed (Task 2-107)
Closet Backup Panel Removed (Task 2-2)
1.
Position copilot’s thrust control (1) fully down
then pull up about 9 inches.
2.
Mount dial indicating scale (2) on grip (3) of
control (1). Use strap (E376).
3.
Position scale (2) at 0 pounds. Align scale
with shaft (4) of control (1). Pull scale up and
measure force to move shaft. Record indication.
Remove scale.
Change 1
11-591
