TM 1-1520-238-23
Change 4
6-27
6.5.
NO. 3 TAIL ROTOR DRIVE SHAFT REMOVAL/INSTALLATION – continued
6.5.6. Installation
CAUTION
When installing No. 3 tail rotor drive shaft
to output coupling flange, ensure that
bolts are installed through 0.250 INCH
bolt holes on output coupling flange. Do
not install bolts through any of 0.500
INCH lightening holes. Installation of
bolts through lightening holes will result in
failure of drive shaft and/or tail rotor cou-
pling.
a. Install drive shaft (1). Torque bolts (4) and (2) to
125 INCH-POUNDS.
(1) Position and support shaft (1) between
flanges (3) and (5). Aline holes.
(2) Install five bolts (4) through flange (5) and
shaft (1).
(3) Torque five bolts (4) to 125 INCH-POUNDS.
Use torque wrench adapter and torque
wrench.
(4) Install five bolts (2) through flange (3) and
shaft (1).
(5) Torque five bolts (2) to 125 INCH-POUNDS.
Use torque wrench adapter and torque
wrench.
(6) Apply corrosion preventive compound to
bolts (4) and (2). Use corrosion preventive
compound (item 62A, App F).
b. Inspect (QA).
c. Secure forward catwalk (para 2.84).
d. Secure access doors T250L, T250R, T290L,
T290R, and L325 (para 2.2).
e. Perform drive system vibration mainte-
nance operational check (TM 1-1520-238-T).
END OF TASK
M04-0433-6
5
1
3
1
4
OPPOSITE
END OF
DRIVE SHAFT
M04-0433-5
1
3
2
