TM 1-1520-238-T-6
9–498
9–228. FUEL TRANS CIRCUIT BREAKER (CB56) – DOES NOT STAY CLOSED
9–228
OR 28 VDC IS NOT PRESENT AT P2-D
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-7
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 FUEL TRANS circuit breaker (CB56)
stay closed?
YES
Go to step 4.
NO
Go to step 2.
2. Open CB56 and set BATT/EXT PWR switch to
OFF. Check for short between P2-D and ground.
Does short exist?
YES
Go to step 3.
NO
Refer to TM 1-1520-238-T-7 to
troubleshoot fuel quantity
indication/transfer system.
3. Detach wire at CB56-2. Check for short between
P2-D and ground.
Does short exist?
YES
Repair shorted wire between
CB56-2 and P2-D.
Go to paragraph 9–220.
NO
Replace FUEL TRANS circuit
breaker (CB56)
(TM 1-1520-238-23).
4. Set BATT/EXT PWR switch to OFF. Check for
open between:
CB56-1 and P4-G,
CB56-2 and P2-D.
Does open exist?
YES
Repair open wire.
Go to paragraph 9–220.
NO
Replace FUEL TRANS circuit
breaker (CB56)
(TM 1-1520-238-23).
END OF TASK
