TM 55-1520-240-23-7
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MISCELLANEOUS EQUIPMENT
(Continued)
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EMERGENCY HOOK RELEASE RELAY BOX
The emergency hook release relay box is located on the
left side at sta. 270. The relay box contains 3 relays, 4
diodes, 3 resistors and a time delay relay which controls
the operation of all three cargo hooks in the emergency
mode. When the emergency release switch is set to
RELEASE ALL, the forward and aft cargo hooks when
loaded will open and close and remain unlatched for
between 10 to 14 seconds. The mid cargo hook will
open and remain open for between 10 to 14 seconds.
Helicopter wiring is connected to box components
through two plugs and receptacles.
DUAL CARGO HOOK RELAY BOX
The dual cargo hook relay box is located on the
right side at sta. 270. It contains relays, diodes, and
PRESS-TO-TEST lamps. Helicopter wiring is connected
to the box components through two plugs and two
receptacles. The relay box controls the operation of all
three cargo hooks in the normal mode of operation.
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