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of the load.
(6) Reel out the cable slowly to provide slack in
the cable. The hook can either be left attached to the load
or disconnected. If the hook is disconnected, it should be
attached to a tiedown fitting to prevent in-flight vibrations
damage to the cargo floor.
f. Rigging and operating procedures for use of the
winch in the rescue mode as follows:
NOTE
The cargo hook assembly must be removed
from the rescue hatch.
(1) Using the hoist control switch on either the
cockpit overhead panel or on the winch/hoist control grip,
reel out the winch cable as required for rigging. As the
cable is being reeled out, a crewman should maintain
tension on the cable to avoid snarling and kinking. After
the cable is extended, the usable cable length will be
checked to ensure that the cable is free of broken strands
or definite bends that may reduce the cable capability.
TM 1-1520-240-10
4-3-9
CAUTION
Some pulley block assemblies have
flanges with cable retainer pins as shown
in fig. 4-3-9 (Sheet 1 of 2). These pins
should be installed only if the cable makes
a wrap angle of 180 or more around the
pulley. Otherwise, the cable will bind on
the pins and overload the winch and cable.
When not in use, the pins and attaching
hardware should be stowed in the container
provided for the hoist accessories.
(2) Install the pulley block assembly on the floor
at sta 140, the overhead on the aft face of sta 120 bulkhead
and the cable cutter pulley block over the rescue
hatch (fig. 4-3-9 (Sheet 2 of 2)).
(3) Reeve the cable through the pulley at each
location by first removing the quick-release pin, removing
the pulley and positioning the cable over the pulley. Reinstall
each pulley and secure with the quick-release pin
(fig. 4-3-9 (Sheet 1 of 2)).
Figure 4-3-9. Hoisting System (Sheet 1 of 2)
WARNING
The quick-disconnect cover guard must
be installed during rescue and cargo operations.
Otherwise, the hook assembly
can be inadvertently disconnected from
the winch cable which can result in loss of
life or the load or serious injury to operating
personnel. For personnel rescue, the
cable must touch the ground or water
prior to touching personnel or a dangerous
static electrical shock may result.
(4) Attach the winch cable to the cable hook
assembly by depressing the lock rings on each end of the
quick-disconnect device, inserting the ball ends of the
winch and hook assembly cables into the quick-disconnect
device and releasing the lock rings. Install the quickdisconnect
cover guard.
WARNING
Slack must be removed from the cable
train before applying the full load to the
winch system to prevent shock and overload
of the system and possible injury to
the personnel being hoisted.
CAUTION
Ensure that the load is clear of the ground
and all obstacles before proceeding from
hover to forward flight. Do not exceed 600
pounds. An overload can result in damage
or failure of the support structure for the
overhead cable pulley.
(5) Reel the cable out and attach the cable hook
to load — Reel in or out as required.
g. When electrical power to the winch is not available,
the winch may be operated in emergency mode as
follows:
CAUTION
When the winch is operated in emergency
mode, the cable limit switches are disabled.
To avoid kinking the cable, stop the
winch when there is no less than 3 turns of
cable on the drum. Stop reeling the cable
in when the quick-disconnect guard assembly
contacts the pulley and fairlead
(fig. 4-3-1).
(1) Remove electrical connectors from the hoist
control valve and hoist control shutoff valve on the left
bulkhead of the heater compartment (fig. 4-3-10).
TM 1-1520-240-10
4-3-10
(2) Break the shear wire on the knurled knob of
the hoist control valve.
(3) Push in the plunger on the hoist control shutoff
valve and rotate it 90 degrees to lock the valve open.
(4) Turn the knurled knob on the hoist control
valve clockwise to reel the cable out or counterclockwise
to reel it in. Return the knob to the center (detent) position
to stop the winch.
(5) When use of the winch is completed, turn the
plunger on the hoist control shutoff valve to unlock and
extend it.
TM 1-1520-240-10
4-3-11
Figure 4-3-9. Hoisting System (Sheet 2 of 2)
TM 1-1520-240-10
4-3-12
Figure 4-3-10. Hoist Control Valve and Hoist
Control Shutoff Valve
4-3-4. Winching Accessories.
Accessories are provided for winching and hoisting operations.
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