TM 1-1520-238-23
1-274.2
Change 4
1.85.
HOISTING – MAIN ROTOR HEAD REMOVAL – continued
CAUTION
Plan to provide clearance during crane
operation.
g. Crank winch (15) up and hoist head (2) above
static mast (16).
h. Position head (2) over main rotor head mount
fixture (17).
(1) Rotate head (2) to a position that will clear
boom arm (7).
(2) Rotate handle (6) to up position to allow later-
al movement of boom arm (7).
(3) Use two tag lines (8) to move boom arm (7).
Turn boom arm (7) to aline head (2) over
fixture (17).
(4) Rotate handle (6) to down position to prevent
lateral movement of boom arm (7).
(5) Crank winch (15) down and slowly lower rotor
head (2) on fixture (17).
i. Remove retainer (10) from head (2).
(1) Loosen nut (12).
(2) Disengage quick coupler (11). Open retainer
(10).
(3) Remove retainer (10) from bottom groove of
head (2).
j. Release tension on lifting cable after instal-
ling head (2) on fixture (17).
(1) Crank winch (15) down to provide cable slack
below eye (9).
k. Retract hook (1).
(1) Unsnap hook (5) from eye (9).
(2) Crank winch (15) up to position hook (5)
about 6 inches below boom sheaves (18).
END OF TASK
6
15
7
17
M04-2242-2A
16
5
2
8
18
M04-2242-6
2
11
10
12
9
