TM 55-1520-240-23-4
5-101
REMOVE DRIVE ARMS
5-101
INITIAL SETUP
Applicable Configurations:
All
Tools:
Aircraft Mechanic’s Tool Kit, NSN 5180-00-323-4692
Metal Rod, 1/8 Inch Diameter x 6 Inches Long
Materials:
Plastic Strap (E374)
Personnel Required:
Medium Helicopter Repairer
Equipment Condition:
Battery Disconnected (Task 1-39)
Electrical Power Off
Hydraulic Power Off
Pitch Links Disconnected From Swashplate (Task
597)
One Forward and One Aft Blade Tied Down (Task
1-26)
Pylon or Forward Work Platforms Open (Task 2-2)
General Safety Instructions:
Do not try to pry bolts free.
Swashplate, drive arm, or drive collar
will be damaged.
NOTE
The procedure to remove forward or
aft drive arms is similar. Removal of
forward drive arms is shown here.
With 46 , a positive retention bolt is
installed at each end of the upper
drive arm. They have a pawl which
prevents nut or bolt removal unless
the pawl is depressed (Task 1-14).
Without 46 , impedance bolts are
installed in upper and lower drive arm
lugs. These bolts are self-retaining
and require a special nut and torque
(Task 1-14).
5-613
