TM 55-1520-240-T
16-1.4 EXTERNAL CARGO HOOK SYSTEM OPERATIONAL CHECK
16-1.4
INITIAL SETUP
Personnel Required:
Applicable Configurations:
Medium Helicopter Repairer (2)
All
References:
Tools:
TM 55-1520-240-23
Rope, 15 Foot
Equipment Condition:
Without 35 Load 20-25 Pounds (3)
TM 55-1520-240-23:
With 35 Load, 20-25 Pounds (2) Fwd and Aft Hook
Battery Connected
Load, 45-50 Pounds (1) Center Hook
Electrical Power On
Wood Plank, 2-Inches x 4-Inches x 4-Feet
Hydraulic Power On
Dial Indicating Scale, 0 to 50 Pounds
Visual Check Of External Cargo Hook System
Stopwatch
Performed (Task 16-1.3)
Inspection Mirror
Area Beneath Three Cargo Hooks Clear Of
Materials:
Obstructions
None
TASK
RESULT
1.
Check that MASTER switch (1) is OFF.
If switch (1) is not OFF, set it to OFF.
2.
Check that HOOK SELECT switch (2) is at FWD.
If switch (2) is not at FWD, set it to FWD.
3.
Check that switch guard (3) over EMERG switch is
If switch guard (3) is up, close it.
down.
4.
Check that CARGO HOOK switch (4) is at RMTE.
If switch (4) is not at RMTE, set it to RMTE.
5.
Check FWD and AFT HOOK LOADED LIGHT lights (5
Both lights (5 and 6) shall be out. If either light is on, go to
and 6).
Task 16-1.5.
6.
Press and release FWD HOOK LOADED light (5).
Light (5) shall momentarily come on. If it does not, go to
Task 16-1.6.
7.
Press and release AFT HOOK LOADED light (6).
Light (6) shall momentarily come on. If it does not, go to
Task 16-1.6.
8.
Check that CARGO HOOK EMR REL PWR and CONT
If CARGO HOOK EMER REL PWR or CONT circuit
circuit breakers (7 and 8) are closed.
breaker (7 or 8) is open, close it. If EMERG REL PWR
circuit breaker (7) opens again, go to Task 16-1.7. If
EMER REL CONT circuit breaker (8) opens again, go to
Task 16-1.8.
9.
Check that CARGO HOOK NORM RLSE PWR and
If CARGO HOOK NORM RLSE PWR or CONT circuit
CONT circuit breakers (9 and 10) are closed.
breaker (9 or 10) is open, close it. If NORM RLSE PWR
circuit breaker (9) opens again, go to Task 16-1.9. If
NORM RLSE CONT circuit breaker (10) opens again, go
to Task 16-1.10.
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