TM 1-1520-240-104-3-20 HOOK OPEN caution capsules come onand the hooks open or the solenoids acti-vate.14. CARGO HOOK MSTR switch — RESETand release to OFF. Check all HOOK OPENcautions go out and the hooks close.15. To confirm safety of the cargo hook system,the pilot, copilot, and flight engineer eachpress a CARGO HOOK RELEASE switch toattempt to open cargo hooks with the CAR-GO HOOK MSTR switch at OFF. 4-3-17. Normal Operation of Cargo hooks.Normal operation of the cargo hooks from the cockpit orfrom the cargo compartments is as follows:1. CARGO HOOK MSTR switch — ARM. (Ifused from the cockpit or the cargo compart-ment.)2. HOIST OPERATORS PANEL CARGOHOOK switch — ARM. (if used from thecargo compartment.)3. HOOK SEL switch — ROTATE to hook orhooks to be released.4. CARGO HOOK RELEASE switch — Press.(From either the cockpit or the cargocompartment) 5. Master caution panel — Check HOOKOPEN cautions come on.6. Loads — Check released. If the forward oraft hooks did not open because of slingslack, press the release switch and lift thehelicopters to apply a strain to the sling andpull the hooks open.4-3-18. Emergency Operation of Cargo Hooks.Refer to Chapter 9 for emergency operation of cargohooks.4-3-19. Helicopter Internal Cargo Handling System(HICHS).An internal cargo handling system is provided for quickloading securing and unloading of palletized cargo (fig.4-3-15 and 4-3-17). The system consists of a set of railassemblies and guide roller assemblies that are securedto the helicopter floor. For descriptive information, ser-vice/maintenance instructions. operation, installationand removal instructions, refer to TM 55-1680-358-12 &P.The system has three main sections: a cabin section, aramp section, and a ramp extension section (fig. 4-3-17).The cabin section has outboard rail/rollers along bothsides of the cabin, and inboard guide rollers runningalong the center of the cabin. There are six outboardrail/roller assemblies, three on each side of the cabin.Each of the six rail/roller assemblies has its own dedi-cated location in the helicopter. The left and right side rail/roller assemblies are symmetrically opposite. There are fourinboard guide roller assemblies mounted in the center of thecabin floor. All of the outboard and inboard guide roller as-semblies are installed by being bolted to the existing tiedownfitting locations in the cabin floor.The system is equipped with a set of locking devices andtiedown fittings for securing loaded cargo.NOTEAll cargo must be properly restrained to en-sure safe operation of the helicopter and thesafety of personnel. Loads must be restrainedin accordance with procedures and guide-lines in Chapter 6 and TM 10-450-2, Helicop-ter Internal Loads.The ramp section has two inboard roller assemblies alongthe center of the ramp and two outboard guide/roller assem-blies along the sides of the ramp. A ramp support assemblyis used to support the ramp when loading or unloading thehelicopter with the ramp in the horizontal positionThe ramp extension section has two ramp extension roll-er assemblies and two ramp extension support assem-blies to support the ramp extensions when loading andunloading with the ramp in the horizontal position.
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