TM 1-1520-240-104-3-14 The hook assembly consists of a hook, hydraulic actua-tor, and a release mechanism. The hook is suspended bymeans of a beam which is mounted inside the rescuehatch. This beam rotates within its mounting supports forlongitudinal swing. The hook pivots about its attachmentbolt for lateral swing. The cargo hook system is normallyoperated hydraulically by pressure from the utility hy-draulicsystem. In the event of a loss in utility systempressure, the cargo hook can be opened pneumaticallyor manually. The cargo hook contains a spring-tensionedkeeper which prevents accidental loss of cargo throughslippage of the sling rings. When not in use, the cargohook can be removed from the hatch since both the elec-trical and hydraulic lines are equipped with quick-discon-nectors or the cargo hook can be stowed. The cargo hookand beam assembly must be removed for rescue opera-tions through the hatch.4-3-9. Center Cargo Hook Loading Pole.WARNINGMake sure the ground cable is connected.With the rotors turning, static potential be-tween the helicopter and a load on theground can be as high as 40,000 volts.A cargo hook loading pole (fig. 4-3-12) is provided forpicking up the sling loop of external cargo loads frominside the helicopter. The loop is then placed on the cargohook by hand. The pole has a hook at one end and acable at the other end. The cable is attached to the fuse-lage to prevent accidental loss of the pole when in useand to provide a discharge path for static electricity.When not in use, the pole is stowed on the lower right sideof the cabin at about sta 360.4-3-10. Forward and AFT Cargo Hooks,The forward and aft cargo hooks (fig. 4-3-14) are at-tached to bottom centerline of the helicopter at sta 249and 409. Unlike the center hook, these hooks are notaccessible to the crew in flight. Both hooks have electri-cal normal
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