The hook assembly consists of a hook, hydraulic actua-
tor, and a release mechanism. The hook is suspended by
means of a beam which is mounted inside the rescue
hatch. This beam rotates within its mounting supports for
longitudinal swing. The hook pivots about its attachment
bolt for lateral swing. The cargo hook system is normally
operated hydraulically by pressure from the utility hy-
draulicsystem. In the event of a loss in utility system
pressure, the cargo hook can be opened pneumatically
or manually. The cargo hook contains a spring-tensioned
keeper which prevents accidental loss of cargo through
slippage of the sling rings. When not in use, the cargo
hook 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 hook
and beam assembly must be removed for rescue opera-
tions through the hatch.
4-3-9. Center Cargo Hook Loading Pole.
Make sure the ground cable is connected.
With the rotors turning, static potential be-
tween the helicopter and a load on the
ground can be as high as 40,000 volts.
A cargo hook loading pole (fig. 4-3-12) is provided for
picking up the sling loop of external cargo loads from
inside the helicopter. The loop is then placed on the cargo
hook by hand. The pole has a hook at one end and a
cable at the other end. The cable is attached to the fuse-
lage to prevent accidental loss of the pole when in use
and to provide a discharge path for static electricity.
When not in use, the pole is stowed on the lower right side
of 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 249
and 409. Unlike the center hook, these hooks are not
accessible to the crew in flight. Both hooks have electri-