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 op-
erations. Employment of these accessories is deter-
mined by winch usage. A compartment bag is attached
to the bulkhead wall above the winch for stowage of
winching accessories.
a.
Cable Pulleys. A sufficient number of pulleys are
provided to permit routing the winch cable for winching
and hoisting operations. The pulleys are equipped with
snap-lock fasteners for attachment to tiedown fittings or
shackles as required.
b.
Cable Hook. A 2-ton-capacity removable hook is
provided for use in winching and hoisting operations.
Extending from the hook is a length of 1/4 inch cable,
equipped with a metal ball which locks into a quick-dis-
connect device that is used for attaching the hook to the
cable. The full-swiveling hook contains a spring snap
lock to prevent opening of the hook and accidental loss
of cargo.
c.
Quick-Disconnect Device. The quick-discon-
nect device permits rapid connecting and disconnecting
of winch cable hooks. The device consists of a short
length of steel with socket cavities at each end. The
sockets are enclosed by spring-loaded rings that rest
against flared rims in either edge of the device. The lock-
rings are depressed to admit the ball ends of the cables
into the sockets and snap into place when released, se-
curing the ball ends of the cables in a positive connection.
A guard is supplied with the quick-disconnect device.
When installed, it prevents the hoist operator from inad-
vertently operating the quick-disconnect device when
assisting a rescued person into the helicopter.
d.
Cable cutter. In hoisting operations, there is al-
ways a possibility that the cable hook might snag, result-
ing in critical strain on the hoisting system and restriction
of helicopter mobility. The cable cutter provides a means
of quickly severing the snagged hook by cutting the
cable. The cable cutter consists of a housing, two follow-
er rollers that permit free travel of cable through the hous-
ing, a cutting shell, a ballistic cartridge, and a threaded
receptacle for electrical connector. The cutter housing is
split to allow reeving the cable and is bolted to a pulley
bracket through two holes in the housing. The cable cut-
ter is armed by coupling an arming device to the recep-
tacle in the cutter housing and plugging the device into
the receptacle above the utility hatch marked CABLE
CUTTER. The cable cutter cartridge is to be checked for
total time prior to any hoisting or rescue operations. The
cartridge should not be used after 8 years from date of
manufacture and should also be replaced after 1 year of
installed service life. Cartridges are considered over age
when either limit is exceeded.
WARNING
If personnel are in the cargo compartment
when a load is jettisoned, make sure that
they remain aft of the rescue hatch and
face away from the cable cutter. The hoist
cable can whip forward when it is cut and
particles can be ejected from the cable
cutter.
