TM 1-1520-238-T-5
8–80
8–14.
CPG EMERG BATT ENG INST CIRCUIT BREAKER – DOES NOT STAY CLOSED
8–14
(HELICOPTERS WITH CPG DIM/TEST PANEL INSTALLED)
Tools:
Nomenclature
Part Number
Tool Kit, Aircraft
SC518099CLA01
Mechanic’s
Tool Kit, Electrical
SC518099CLA06
Repairer’s
Multimeter, Digital
AN/PSM-45
Personnel Required:
67R
Attack Helicopter Repairer
68X
Armament/Electrical Systems Repairer
References:
TM 1-1520-238-T-6
TM 1-1520-238-23
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. Open CPG EMERG BATT ENG INST circuit
breaker. Check for short between (A77):
J1–8 and ground,
J1–10 and ground.
Does short exist?
YES
Refer to TM 1-1520-238-T-6 to
troubleshoot circuit protection
system (dc emergency bus –
pilot station)
NO
Go to step 2.
2. Detach P401. Check for short between:
P766–8 and ground,
P766–10 and ground.
Does short exist?
YES
Go to step 3.
NO
Replace SDC
(TM 1-1520-238-23).
3. Detach P1093. Check for short between:
P766–8 and ground,
P766–10 and ground.
Does short exist?
YES
Repair shorted wire between:
P766–8 and P401 SP1,
P766–10 and P401 SP2,
P401–57 and P401 SP1,
P401–58 and P401 SP2,
P1093–20 and P401 SP1,
P1093–21 and P401 SP2.
Go to paragraph 8–10.
NO
Replace CPG ENG INST
dimmer power supply
(TM 1-1520-238-23).
END OF TASK
