TM 1-1520-238-T-6
9–596
9–303. ECS CAB CIRCUIT BREAKER (CB76) – DOES NOT STAY CLOSED
9–303
OR 28 VDC IS NOT PRESENT AT P1-2
Tools:
Nomenclature
Part Number
Tool Kit, Electrical
SC518099CLA06
Repairer’s
Multimeter, Digital
AN/PSM-45
Personnel Required:
68X
Armament/Electrical Systems Repairer
One person to assist
References:
TM 1-1520-238-23
TM 1-1520-238-T-8
WARNING
Turn off power before detaching or
attaching wires and connectors. High
current 28 VDC or 115 VAC is present.
Failure to do so could result in death or
serious injury.
1. On pilot ELEC PWR panel, set BATT/EXT PWR
switch to EXT PWR.
Does ECS CAB circuit breaker (CB76) stay
closed?
YES
Go to step 4.
NO
Go to step 2.
2. Set BATT/EXT PWR switch to OFF. Check for
short between:
CB76-1 and CB31-1,
CB76-2 and P1-2.
Does short exist?
YES
Repair open wire.
Go to paragraph 9–263.
NO
Replace ECS CAB circuit
breaker (CB76)
(TM 1-1520-238-23).
3. On pilot aft circuit breaker panel, open ECS
CAB circuit breaker (CB76). Set BATT/EXT
PWR switch to OFF. Check for short between
P1-2 and ground.
Does short exist?
YES
Go to step 4.
NO
Refer to TM 1-1520-238-T-8 to
troubleshoot environmental
control system.
4. Detach wire end at CB76-2. Check for short
between P1-2 and ground.
Does short exist?
YES
Repair shorted wire between
P1-2 and CB76-2.
Go to paragraph 9–263.
NO
Replace ECS CAB circuit
breaker (CB76)
(TM 1-1520-238-23).
END OF TASK
