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.
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:
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 inoper-
The winch arming switch must be pressed to
operate the winch.
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 move-
ment in either direction.
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.
A cargo hook release switch.
When using the microphone switch on the
hoist control grip, be careful not to press
the cargo hook switch.