TM 1-1520-238-23
1-285
1.90.
HOISTING – MAIN ROTOR SUPPORT (STATIC) MAST INSTALLATION – continued
NOTE
Use a tag line to control mast.
c. Attach tag line to static mast.
(1) Tie 20-foot line to bottom center of mast.
d. Lift mast (7).
(1) Crank winch (6) to hoist mast (7) higher than
top of upper fairing (8).
e. Position mast (7) over support base (9).
(1) Rotate handle (3) to up position to allow later-
al movement of boom arm (4).
(2) Use two tag lines (5) to move boom arm (4).
(3) Turn boom arm (4) to aline mast (7) over base
(9).
(4) Rotate handle (3) to down position to prevent
lateral movement of boom arm (4).
f. Lower mast to base (9).
(1) Crank winch (6) down and slowly lower mast
(7) on base.
g. Install mast mounting washers and nuts (para
6.97).
h. Release tension on lifting cable.
(1) Crank winch (6) to position hook (1) below
eye (2).
i. Remove hook (1) from eye (2).
(1) Unsnap hook (1) from eye (2).
j. Retract hook (1).
(1) Crank winch (6) to position hook (1) about 6
inches below boom sheave (10).
END OF TASK
7
2
1
M04-2247-2
4
9
5
6
3
10
8
