TM 1-1520-238-23
Change 1
2-305
2.88.
ROTOR SUPPORT MAST SUPPORT BASE REMOVAL/INSTALLATION – continued
WARNING
FLIGHT SAFETY PART
The rotor support mast support base
is a flight safety part. Failure to follow
maintenance instructions may result
in serious injury or death of
crewmembers and/or serious damage
to the helicopter.
2.88.3. Removal
a. Attach sling to mast support base (1).
b. Loosen but do not remove eight nuts (2) and
bolts (3) on four left and right transmission
rotor support strut assemblies (4).
c. Cut lockwire and loosen four bolts (5) from
four forward and aft transmission rotor sup-
port strut assemblies (6). Do not remove. Use
socket wrench and telescopic bar.
d. Remove mast base (1).
(1) Remove and discard four cotter pins (8).
(2) Hold four bolts (7). Remove nut (9). Use box
wrench, telescopic bar, and adapter.
(3) Remove four bolts (7) and recessed washers
(10) from mast base (1).
(4) Gently lift and remove mast base (1).
GO TO NEXT PAGE
M04-3086-1
1
M04-3086-2
M04-3086-3
2
4
3
6
5
1
8
9
M04-3086-4A
10
7
TYPICAL
