2.
CARGO HOOK ARMING switch -ARMED.
3.
HOOK ARMED advisory legend -Check on.
4.
Place about 20 pounds downward pressure on load beam.
5.
CARGO REL switch (pilot and copilot); NORMAL RLSE (crewmember) -Press and release.
6.
CARGO HOOK OPEN advisory legend -Check on.
Change 2 4-31
C
D
B
AE
A
B
C
EMERGENCY RELEASE SWITCH
HOOK
CARGO HOOK
EMER REL
EMERG REL CONTR ARMING TEST NORM CKPT SAFE
O P E N
SHORT ALL ARMED
CARGO HOOK CONTROL PANEL
NORMAL RELEASE SWITCH COVER
COLLECTIVE STICK GRIP CYCLIC STICK GRIP
D
LATCH
ASSEMBLY
LEVER
BUMPER
CARGO HOOK
ACCESS DOOR
CABIN
FLOOR
CARGO HOOK STOWAGE CARGO LOAD BEAM SA AA0367_1B
Figure 4-15. Cargo Hook System (Sheet 1 of 2)
4-32
MANUAL
(EXPLOSIVE CARTRIDGE
RELEASE
UNDER COVER)
LEVER
CARGO HOOK
AA0367_2A
SA
Figure 4-15. Cargo Hook System (Sheet 2 of 2)
7.
CARGO HOOK OPEN advisory legend -Check off when hook closes.
8.
Repeat steps 4. through 7. for copilot and crew-member position.
4.7.3.3 Manual Release. Manual release of external cargo can be done from the cabin, through a covered port in the .oor, or by ground personnel from outside the helicop-ter, with power on or off. Turning the release control on the right side of the hook (Figure 4-15) clockwise, causes the latching mechanism to release the load beam. The load beam will not move unless a downward pressure is exerted to cause opening. With power applied to the helicopter and the CARGO HOOK ARMING switch at ARMED, the CARGO HOOK OPEN advisory legend will go on at the start of release control turning, and will go off at the end of release control rotation.
4.7.3.4 Operational Check -Manual Release Mode.
1. Manual release lever spring -Installed. Check that spring is straight and provides positive pressure on the lever.
2.
Place about 20 pounds downward pressure on load beam.
3.
Manual release lever -Pull up/turn fully clock-wise and release.
4.
Load beam -Check open.
5.
CARGO HOOK OPEN advisory legend -On.
6.
When downward pressure is released, load beam will close and latch.
7.
CARGO HOOK OPEN advisory legend -Off when hook closes.
4.7.4 Emergency Release Circuit Tester. The cargo hook emergency release circuit tester (Figure 2-6) marked CARGO HOOK EMERG REL on the upper console, contains a test light and switch. The test light, marked TEST, goes on during circuit testing to indicate the system is functioning properly. The switch, with marked positions NORM, OPEN, and SHORT, is normally at NORM. When the switch is placed to OPEN or SHORT and the cargo HOOK EMER REL switch on the pilot’s or copi-lot’s collective, or EMER RLSE switch on the crewmem-ber’s cargo hook control pendant is pressed, the circuit tester light will go on if the circuit is good.
4.7.4.1 Cargo Hook Emergency Release Circuit
Check.
1. EMERG REL should be on. TEST light -Press. Light
NOTE
To prevent unintentional discharge of the cargo hook explosive cartridge, the pilot shall call off each procedural step of the emergency release circuit test before that step is done. Station being checked shall re-ply to pilot’s command.
2. Pilot’s release -Check.
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