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When stowing or positioning the cargo
hook, do not grasp the hook assembly by
the synchronizing assembly shaft. Serious
injury can result if the hook is operated
while the hand is in this position. The
nylon web strap is to be used when positioning
or stowing the hook.
Before external load operations, perform the following
check of the cargo hooks.
1. CARGO HOOK MSTR switch — ARM.
2. CARGO HOOK SEL switch — FWD.
3. Press the CARGO HOOK RELEASE switch
on the pilot’s cyclic stick — Check that the
FWD HOOK OPEN caution capsule comes
on and the hook opens.
NOTE
The forward and aft hooks will not open unless a force is
applied. As long as one of the CARGO HOOK RELEASE
switches are pressed, the forward and aft hooks will
make a chattering sound. This sound indicates the hook
solenoids are operating normally.
4. CARGO HOOK SEL switch — MID.
5. Press the CARGO HOOK RELEASE switch
on the copilot’s cyclic stick — Check that the
MID HOOK OPEN caution capsule comes
on and the hook opens.
6. CARGO HOOK SEL switch — AFT.
F 7. Press the CARGO HOOK RELEASE switch
on the WINCH/HOIST CONTROLGRIP —
Check that the AFT HOOK OPEN caution
capsule comes on and the hook solenoid
activates. Reset and release to OFF.
8. CARGO HOOK MSTR switch — RESET
and release to OFF. Check all HOOK OPEN
caution lights go out and the hooks close.
Then set ARM.
9. CARGO HOOK SEL switch — TANDEM.
10. Press the CARGO HOOK RELEASE switch
on the pilot’s cyclic stick. Check that the
FWD and AFT HOOK OPEN caution capsules
come on and the forward and aft hook
solenoids activate.
11. CARGO HOOK MSTR switch — RESET
and release to OFF. Check both HOOK
OPEN caution capsules go out and the
hooks close. Then set to ARM.
12. CARGO HOOK SEL switch — ALL.
13. Press CARGO HOOK RELEASE switch on
the copilot’s cyclic stick — Check that all
TM 1-1520-240-10
4-3-20
HOOK OPEN caution capsules come on
and the hooks open or the solenoids activate.
14. CARGO HOOK MSTR switch — RESET
and release to OFF. Check all HOOK OPEN
cautions go out and the hooks close.
15. To confirm safety of the cargo hook system,
the pilot, copilot, and flight engineer each
press a CARGO HOOK RELEASE switch to
attempt to open cargo hooks with the CARGO
HOOK MSTR switch at OFF.
4-3-17. Normal Operation of Cargo hooks.
Normal operation of the cargo hooks from the cockpit or
from the cargo compartments is as follows:
1. CARGO HOOK MSTR switch — ARM. (If
used from the cockpit or the cargo compartment.)
2. HOIST OPERATORS PANEL CARGO
HOOK switch — ARM. (if used from the
cargo compartment.)
3. HOOK SEL switch — ROTATE to hook or
hooks to be released.
4. CARGO HOOK RELEASE switch — Press.
(From either the cockpit or the cargo
compartment)
5. Master caution panel — Check HOOK
OPEN cautions come on.
6. Loads — Check released. If the forward or
aft hooks did not open because of sling
slack, press the release switch and lift the
helicopters to apply a strain to the sling and
pull the hooks open.
4-3-18. Emergency Operation of Cargo Hooks.
Refer to Chapter 9 for emergency operation of cargo
hooks.
4-3-19. Helicopter Internal Cargo Handling System
(HICHS).
An internal cargo handling system is provided for quick
loading securing and unloading of palletized cargo (fig.
4-3-15 and 4-3-17). The system consists of a set of rail
assemblies and guide roller assemblies that are secured
to the helicopter floor. For descriptive information, service/
maintenance instructions. operation, installation
and removal instructions, refer to TM 55-1680-358-12 &
P.
The system has three main sections: a cabin section, a
ramp section, and a ramp extension section (fig. 4-3-17).
The cabin section has outboard rail/rollers along both
sides of the cabin, and inboard guide rollers running
along the center of the cabin. There are six outboard
rail/roller assemblies, three on each side of the cabin.
Each of the six rail/roller assemblies has its own dedicated
location in the helicopter. The left and right side rail/
roller assemblies are symmetrically opposite. There are four
inboard guide roller assemblies mounted in the center of the
cabin floor. All of the outboard and inboard guide roller assemblies
are installed by being bolted to the existing tiedown
fitting locations in the cabin floor.
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