TM 1-1520-240-10
4-3-1
SECTION III. CARGO HANDLING SYSTEMS
4-3-1. Winch/Hoist System.
A 3,000-pound-capacity hydraulically operated winch
(fig. 4-3-1) is mounted on the floor in the right forward
cabin at sta 120. Hydraulic power to operate the winch is
supplied by the utility hydraulic system. The winch (fig.
4-3-2) has 150 feet of usable 1/4 inch cable. It is capable
of winching up to 12,000 pounds of cargo with the aid of
pulley blocks. When used in hoisting mode (fig. 4-3-9),
the load is limited to 600 pounds. The winch has two
maximum reeling speeds: one for cargo loading (20 fpm)
and one for hoisting (100 fpm). When the winch is used
for cargo loading, a selector control lever on the cable
drum housing is moved to CARGO. When the winch is
used for hoisting the selector control lever is moved to
RESCUE. A mechanical braking devise automatically
locks the cable drum when power is off, preventing loss
of load control through cable payout. If the winch cable
load exceeds 3,200 pounds, an overload switch will automatically
stop the winch. The free end of the winch
cable is equipped with a metal ball which locks into one
end of the quick-disconnect devise that is used to attach
hooks to the cable. Both ends of the cable are painted red
for 20 feet to alert the operator that the cable end is
approaching. In CARGO mode, the winch will automatically
stop when the cable is reeled out 150 feet, and at
3 feet when the cable is reeled in. In RESCUE mode, the
winch will stop when the cable is reeled out 150 feet and
at 28.5 feet when the cable is reeled in.
4-3-2. Winch Controls.
The winch can be controlled from the cockpit by switches
on the overhead switch panel (fig. 4-3-3) or from the
cargo compartment by switches on the winch/hoist control
grip. The switches in the cockpit override the
switches on the control grip, enabling the pilot to assume
control of the hoisting operations in an emergency. When
operating from the cargo compartment, the winch-hoist
control grip can be plugged into a receptacle on the auxiliary
control panel (fig. 4-3-4) at sta 95, the hoist operators
panel at sta 320 (fig. 4-3-8), or the receptacle at sta 502
(fig. 4-3-5) by an extension cord. The winch can also be
manually operated from the cabin. These controls are for
emergency use only. The controls are mounted on the
structure in the heater compartment. Instructions for
manual operation of the winch are on the structure above
the control valves and instructions in this section. Electrical
power to operate and control the winch is supplied by
the 28-volt No. 1 DC bus through two circuit breakers on
the No. 1 PDP. These two circuit breakers are marked
HOIST CABLE CUTTER and HOIST CONT.
NOTE
The cable cutter arming devise must be
plugged into the receptacle on the auxiliary
control panel at sta 95 (fig. 4-3-4) and the
cable speed selector lever must be at CARGO
to complete the winch control circuit for
cargo operations. The cable cutter arming devise
must be plugged into the receptacle on
the overhead above the utility hatch (fig.
4-3-6) and the cable speed selector lever
must be at RESCUE to complete the hoist
control circuit for hoisting operations.
a. Winch control switched (overhead switch panel).
(1) Hoist master switch. A toggle hoist master
switch is on the hoist control panel (fig. 4-3-3). The switch
(labeled HOIST MSTR) has positions marked REMOTE,
OFF, and PLT. When the switch is at REMOTE, electrical
power from the 28-volt No. 1 DC bus, through the HOIST
CONT circuit breaker, energizes the winch arming switch
on the winch/hoist control grip. Once this switch is
pressed, the winch cable switch, also on the grip, is energized,
allowing the winch reeling speed to be controlled
at the hoist operator’s station. When the master switch is
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