16-1.4 EXTERNAL CARGO HOOK SYSTEM OPERATIONAL CHECK (Continued)
Set MASTER switch (1) to RESET, then to OFF.
Forward and aft cargo hooks shall remain closed. Center
cargo hook shall close and remain closed. FWD HOOK
OPEN, MID HOOK OPEN, and AFT HOOK OPEN cap-
sules (11, 12 and 13) shall go out. Pilot and copilot master
caution lights (24) shall go out.
Suspend one 20-25 pound load from each load beam
(23) on forward and aft cargo hooks.
49. Check center cargo hook gage (15).
Gage (15) shall indicate at least 2100 psi. If it does not,
service center cargo hook actuator (TM 55-1520-240-23).
If gage indication is below 2100 psi,
inadvertent cargo hook operation could
occur resulting in loss of external load.
Injury or death to personnel can occur.
Do not stand near center cargo hook
when EMERG switch is set to REL ALL.
High pressure air, possibly mixed with
oil, will be vented from cargo hook.
Injury to personnel can occur.
50. Lift switchguard over EMERG switch (3). Momen-
All cargo hooks shall open and following shall occur for 10
tarily set EMERG switch to REL ALL.
to 14 seconds: Forward and aft cargo hook load beams
(23) shall open, drop loads and then close. Center cargo
hook shall remain open. FWD HOOK OPEN, MID HOOK
OPEN, and AFT HOOK OPEN capsules (11, 12 and 13)
shall come on and pilot and copilot master caution lights
(24) shall come on.
Center cargo hook shall close after 10 to 14 seconds. The
MID HOOK OPEN capsule (12) shall go out. If any cargo
hook does not open, go to Task 16-1.27. If center cargo
hook opens but does not stay open for 10 to 14 seconds,
go to Task 16-1.28.
50.1 Set MASTER switch (1) to RESET, then to OFF.
Capsules (11 and 13) and lights (24) shall go out.
51. Close switchguard over EMERG switch (3).
52. Without 35 service center cargo hook actuator (TM
55-1520-240-23). Suspend 20-25 pound load to tongue
(16) on center cargo hook.
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16-16 ECP D218