TM 55-1520-240-23-9
11-28
INSTALL SERVOCYLINDER SAFETY BLOCKS
11-28
INITIAL SETUP
Applicable Configurations:
All
Tools:
Aircraft Mechanic’s Tool Kit, NSN 5180-00-323-4692
Safety Blocks (T31) (4)
Materials:
None
Personnel Required:
CH-47 Helicopter Repairer (2)
Inspector
Equipment Condition:
Battery Connected (Task 1-39)
Electrical Power On
Hydraulic Power On
Copilot’s Control Stick Positioned at Neutral (Task
11-33)
Copilot’s Yaw Pedals Positioned at Neutral (Task
11-33)
AFCS SYSTEM SEL Switch Set to OFF
Forward and Aft Work Platforms Open (Task 2-2)
General Safety Instructions:
WARNING
Severe rotor head damage can
result when installing safety blocks
when any main rotor blade has been
removed if lead lag dampner is
installed. Remove lead lag dampner
prior to installing blocks if main rotor
blade is removed or secure dampner
to ensure no damage will result.
CAUTION
Prior to installation of servocylinder
safety blocks, measure the blocks. If
servocylinder blocks are 6.0 inches
in length, contact your local AMCOM
Logistic Assistance Representative
(LAR) for assistance/instructions.
Actuator blocks are to be 5.0 inches
in length to preclude the possibility of
the upper boost actuator creeping up
during static maintenance conditions.
1.
Working in cockpit, press copilot’s THRUST
CONT BRAKE TRIGGER switch (1). Pull control
grip (2) up about 5 inches. Release trigger
switch.
Change 1
11-95
