Section II ARMAMENT
Not Used.
Section III CARGO HANDLING SYSTEMS
4.7 CARGO HOOK SYSTEM.
The system consists of a hook assembly (Figure 4-15) mounted on the lower fuselage, a control panel on the up-per console (Figure 2-6), a normal release button on each cyclic stick grip, one emergency release switch on each collective stick grip, and a .ring key in the cabin for use by the crew chief. The hook capacity is limited to a maximum of 8,000 pounds for UH-60Q aircraft. The system incorpo-rates three modes of load release, an electrical circuit actu-ated from the cockpit, a manual release worked by the crewmember through a covered hatch in the cabin .oor, and an emergency release system using an electrically-activated explosive charge.
4.7.1 Cargo Hook Stowage. The cargo hook shall be maintained in the stowed position during periods of non-use. The cargo hook can be placed in a stowed position (Figure 4-15) by opening the cargo hook access cover in the cabin .oor, and pulling the hook to the right and up. When the hook is in the stowed position, the load beam rests on a spring-loaded latch assembly and is prevented from vibrating by a te.on bumper applying downward pressure on the load beam. To release the hook from its stowed position, downward pressure is placed on the latch assembly lever, retracting the latch from beneath the load beam, allowing the cargo hook to swing into operating po-sition.
4.7.2 Cargo Hook Control Panel. The CARGO HOOK control panel (Figure 4-15), on the upper console, consists of an EMERG REL NORM, OPEN, SHORT test switch, a TEST light, CONTR CKPT or ALL station selector switch and an ARMING, SAFE, ARMED switch. Before the normal release (electrical) can operate, the ARMING switch must be at ARMED to provide electrical power to the release switches. The pilot and copilot CARGO REL switches, on the cyclics, will release the load when the CONTR switch is at CKPT or ALL. The crewmember’s NORMAL RLSE switch will release the load when the CONTR switch is at ALL. The EMERG REL switch and TEST light permits checking the emer-gency release circuit when at SHORT or OPEN. In both cases of testing, if the release circuit is good, the TEST light will go on when the HOOK EMER REL switch on pilot’s or copilot’s collective, or the EMER RLSE switch on the crewmember’s pendant, is pressed.
4.7.3 Crewmember’s Cargo Hook Control Pen-dant. The crewmember’s cargo hook control pendant (Figure 4-16), in the aft cabin, provides the crew chief with an electrical release and jettison of an external load when the CARGO HOOK CONTR switch is placed to ALL. The NORMAL RLSE and EMER RLSE switches are covered by guards to prevent accidental activation. When the cover is raised the switch can be pressed. When not in use, the pendant is stowed in the stowage bag at the back of the pilot’s seat. Electrical power to operate the pendant is provided from the No. 2 dc primary bus through a circuit breaker, marked CARGO HOOK CONTR.
4.7.3.1 Normal Release. Normal release of external cargo is done by pressing the CARGO REL switch on either cyclic stick grip or the CARGO HOOK NORMAL RLSE on the crewmember’s cargo hook pendant, after placing the CARGO HOOK ARMING switch to ARMED. A legend on the MFD will go on, indicating HOOK ARMED. This informs the pilot that electrical power is applied to the control circuit; the actuation of any of the release switches will release the load. When the CARGO REL switch is pressed and the release solenoid begins to move, a switch closes, lighting the CARGO HOOK OPEN advisory legend. The load arm will swing open, releasing the cargo. When the sling is detached from the load beam, spring tension on the arm will cause it to close and relatch, putting out the CARGO HOOK OPEN advisory legend. The normal release system is a one-shot cycle; once the solenoid travel begins and the load arm relatches, the release cycle can again be initiated. Power to operate the normal release system is supplied from the No. 2 dc primary bus through circuit breakers marked CARGO HOOK CONTR and PWR.
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