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on the HOOK SELECT switch will open. The forward
and aft hooks will open, then close. The center
hook, if selected, will open and remain open until the
cargo hook MASTER switch on the overhead panel is set
to OFF or the cargo hook ARM switch on the hoist operators
panel is set to RESET.
TM 1-1520-240-10
4-3-17
Figure 4-3-13. Center Cargo Hook and Cargo Hook Release
TM 1-1520-240-10
4-3-18
Figure 4-3-14. Forward and Aft Cargo Hooks
CAUTION
The forward and aft hooks may fail to open
if the slings are slack when the release
solenoids are energized (a load of approximately
20 pounds is required for opening).
The hooks can be opened by selecting
the desired hook(s) and depressing
the release switch as the aircraft is lifted to
apply tension to the slings.
e. CARGO HOOK EMERG Switch. The emergency
cargo hook release switch is on the CARGO HOOK
control panel. It is a guarded switch and it is labeled
EMERG REL ALL (emergency release all). The switch is
used to simultaneously open the three hooks, if an emergency
situation develops. The three hooks will open regardless
of CARGO HOOK MSTR or HOOK SEL switch
positions. Setting the switch to REL ALL, energizes an
emergency hook release relay. The relay then energizes
release solenoids in the forward and aft hooks and a
solenoid valve in the center hook. The solenoid valve in
the center hook releases the aircharge stored in the lower
half of the hydraulic actuator, transferring the charge
to the upper (release) half of the actuator to open the
hook. After this method of opening the hook, the hook
actuator must be recharged to 2,000 to 2,100 psi. The
emergency hook release relay will automatically deenergized
after a 10 second time delay. This prevents damage
to the hook release solenoids.
CAUTION
Before external load operations, crew–
members shall familiarize themselves
with the manual emergency cargo release
mechanism installed on the helicopter
WARNING
When the center cargo hook is opened
with the external load off the ground, the
cargo hook will whip back back and forth.
CAUTION
When the center cargo hook is opened using
the manual emergency release handle,
the hook must be closed manually. No attempt
should be made to close the hook
using the normal hydraulic or pneumatic
method, since damage to the cargo hook
can result.
TM 1-1520-240-10
4-3-19
4-3-12. Manual Release System.
NOTE
Depending on the mission requirement, the
manual release lever may be positioned in the
forward or stowed position.
The manual emergency release lever for all three cargo
hooks is located on the right side of the rescue hatch
door. The lever is connected by cables to the manual
release mechanism in each hook. The lever has three
positions; forward, vertical, and aft. In the forward position
the lever is stowed. In the vertical position the lever
is in the normal position when external cargo is carried
on any of the hooks. In the aft position the lever releases
all hooks simultaneously, loaded or not.
4-3-13. Cargo Hook Cautions.
The cargo hook caution capsules are on the master caution
panel. They are labeled FWD HOOK OPEN, MID
HOOK OPEN, and AFT HOOK OPEN. A lit caution capsule
indicates that the corresponding hook has opened.
The cautions can be extinguished by setting the CARGO
HOOK MSTR switch to RESET or by setting the CARGO
HOOK switch on the hoist operators panel to RESET.
4-3-14. Hook Loaded Advisory Lights.
Two advisory lights marked HOOK LOADED are on the
CARGO HOOK control panel (fig 4-3-3). The lights are
marked HOOK LOADED. When on, the light indicates
that the corresponding (forward or aft) hook has a load
of above approximately 150 pounds on it. The lights are
turned on by sensors in the forward and aft hooks.
WARNING
If the DUAL HOOK FAULT light indicates a
malfunction of the forward or aft hook, releasing
the load using other than the
manual release handle is prohibited.
4-3-15. Dual Hook Fault Caution.
A caution capsule labeled DUAL HOOK FAULT is on the
master caution panel. The light provides continuous
monitoring of the electrical continuity of the release solenoids
in the forward and aft hook. When on, it indicates
a loss of electrical release capability of the forward and/or
aft hook in both normal and emergency modes. When the
capsule is on, loads on the forward or aft hooks can only
be released by the manual release system.
4-3-16. Cargo Hooks Operational Check.
WARNING
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