TM 55-1520-240-T16-1.4 EXTERNAL CARGO HOOK SYSTEM OPERATIONAL CHECK (Continued)16-1.4TASKRESULT47.Set MASTER switch (1) to RESET, then to OFF. Forward and aft cargo hooks shall remain closed. Centercargo hook shall close and remain closed. FWD HOOKOPEN, MID HOOK OPEN, and AFT HOOK OPEN cap-sules (11, 12 and 13) shall go out. Pilot and copilot mastercaution lights (24) shall go out.48.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 2100psi. If it does not,service center cargo hook actuator (TM 55-1520-240-23).WARNING·If gage indication is below 2100 psi,inadvertent cargo hook operation couldoccur resulting in loss of external load.Injury or death to personnel can occur.·Do not stand near center cargo hookwhen EMERG switch is set to REL ALL.High pressure air, possibly mixed withoil, 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 10tarily set EMERG switch to REL ALL. to14seconds:Forward and aft cargo hook load beams(23) shall open, drop loads and then close. Center cargohook shall remain open. FWD HOOK OPEN, MID HOOKOPEN, 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 10to14seconds. TheMID HOOK OPEN capsule (12) shall go out. If any cargohook does not open, go to Task 16-1.27. If center cargohook opens but does not stay open for 10to14seconds,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 (TM55-1520-240-23). Suspend 20-25 pound load to tongue(16) on center cargo hook.GO TO NEXT PAGE16-16 ECP D218
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