TM 1-1520-238-23
5-108
5.21.
MAIN ROTOR HEAD REMOVAL/INSTALLATION – continued
5.21.6. Installation
a. With assistants, install head (1) on mast (2)
(para 1.86).
b. Inspect (QA).
c. Install main rotor hub retention nut (para 5.20).
d. Install main rotor brush, electrical holder, and
pitch web electrical lead (para 5.48).
e. Install secondary main rotor scissor (para
11.18).
f. Install load bearing main rotor scissor (para
11.16).
g. Remove maintenance crane (para 1.105).
h. Secure access doors T250L, T250R, T290L,
T290R, and L325 (para 2.2).
NOTE
If the main rotor head was removed to
facilitate other maintenance and the
same main rotor head is re-installed (with
no other maintenance accomplished on
the head), the equipment conditions for
paragraph 5.8 to perform the collective
and cyclic flight controls rigging mainte-
nance operational check is not required.
i. Perform main rotor blade phase adjustment
(para 5.8).
END OF TASK
M04-224-5
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