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at PLT, electrical power energizes the hoist control switch
on the overhead switch panel, which gives the pilot control
of the hoisting system. When the switch is at OFF,
power is removed from the hoist control switches at both
stations.
(2) Hoist control switch. A spring-loaded, rheostat-
type switch is provided for hoist control and is on the
hoist control panel. The switch (labeled HOIST) has positions
marked OFF, IN, and OUT. When the hoist master
switch is at PLT, electrical power, from the 28-volt No. 1
DC bus through the HOIST CONT circuit breaker, energizes
the hoist control switch. Then the switch is moved
to IN or OUT, the hoist brake release solenoid valve is
energized open. The open valve applies hydraulic pressure
through the hoist control valve to the winch to turn
the cable drum in the appropriate direction. The speed of
the cable is proportional to hoist control switch movement.
When the switch is released, the switch assumes
the center OFF position. In addition, the brake release
solenoid valve is deenergized closed, which removes
hydraulic pressure to brake the cable drum.
TM 1-1520-240-10
4-3-2
(3) Cable cutter switch. A cable cutter switch is
on the left side of the hoist control panel. The guarded
switch (labeled CABLE CUT) has positions marked ON
and OFF. When the switch is at ON, electrical power from
the 28-volt No. 1 DC bus, through the CABLE CUTTER
circuit breaker, detonates a ballistic cartridge in the cable
cutter which cuts the cable. When the switch is at OFF,
the cable cutter circuit is deenergized.
b. Winch control switches (fig. 4-3-7). A portable
pistol-shaped control grip contains a built-in microphone
switch and a number of other switches used in hoisting,
winching, and cargo hook operations. A receptacle for
plugging in the extension cord is in the butt end of the
grip. A hook extending from the side of the grip is used
to hang the grip in its stowed position on the hoist control
panel. The switches contained in the grip are as follows:
(1) Winch arming switch. The winch is armed
for use by a trigger-type, spring-loaded switch. When the
switch is pressed, a circuit closes, arming the control
circuits of the winch hydraulic motor. When the switch is
released, the circuit opens, rendering the winch inoperable
NOTE
The winch arming switch must be pressed to
operate the winch.
(2) Winch cable switch. Winch cable reeling is
controlled by a rotary switch on the left side if the control
grip. Action markings around the switch are IN, OFF, and
OUT. The switch is spring-loaded to center OFF position.
When the switch is moved to IN or OUT, a selector valve
in the winch hydraulic system is electrically actuated,
providing hydraulic pressure to turn the cable drum. The
speed of the cable is proportional to cable switch movement
in either direction.
(3) Cable cutter switch. A push button switch on
the upper shoulder of the control grip actuates the cable
cutter. A metal guard marked CABLE CUTTER prevents
accidental closing of the switch. When pressed, the
switch closes a circuit, providing electrical current to fire
a ballistic cartridge in the cable cutter. The firing propels
a cutter which cuts the cable.
(4) A cargo hook release switch.
(5) Microphone switch.
CAUTION
When using the microphone switch on the
hoist control grip, be careful not to press
the cargo hook switch.
TM 1-1520-240-10
4-3-3
Figure 4-3-1. Winching System
TM 1-1520-240-10
4-3-4
Figure 4-3-2. Winch Capabilities (Sheet 1 of 2)
TM 1-1520-240-10
4-3-5
Figure 4-3-2. Winch Capabilities (Sheet 2 of 2)
TM 1-1520-240-10
4-3-6
Figure 4-3-3. Hoist Control Panel
Figure 4-3-4. Auxiliary Control Panel (Station 95)
Figure 4-3-5. Winching Receptacle (Station 502)
Figure 4-3-6. Overhead Cable Cutter Receptacle
TM 1-1520-240-10
4-3-7
Figure 4-3-7. Winch/Hoist Control Grip
Figure 4-3-8. Hoist Operators Panel (Station 320)
4-3-3. Winch Operation.
With hydraulic and electrical power available, the winch
can be operated from the cockpit or from the cargo
compartment, in either the cargo mode (for winching cargo
into the cargo compartment via the ramp) or in the
rescue mode (for rescue or hoisting small cargo through
the rescue hatch).
a. Control settings and electrical connections for
operating the winch in the cargo mode from the cockpit
are as follows:
(1) Cable speed selector lever on the winch —
CARGO.
(2) Cable cutter arming device (or adapter
cable, pig-tail) — Plugged into the auxiliary control panel,
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