TM 1-1520-238-T-6
Change 5
9–524.1
9–248A.NAV EGI CIRCUIT BREAKER (CB97) – DOES NOT STAY CLOSED
9–248A
OR 28 VDC IS NOT PRESENT AT J1-GG
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 11-1520-238-23-2
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 NAV EGI circuit breaker (CB97) stay
closed?
YES
Go to step 4.
NO
Go to step 2.
2. Open CB97. Set BATT/EXT PWR switch to OFF.
Check for short between J1-GG and ground.
Does short exist?
YES
Go to step 3.
NO
Refer to TM 11-1520-238-23-2
to troubleshoot EGI.
3. Detach wire at CB97-2. Check for short between
J1-GG and ground.
Does short exist?
YES
Repair shorted wire between
CB97-2 and J1-GG.
Go to paragraph 9–233.
NO
Replace NAV EGI circuit
breaker (CB97)
(TM 1-1520-238-23).
4. Set BATT/EXT PWR switch to OFF. Check for
open between CB97-1 and CB82-1.
Does open exist?
YES
Repair open wire.
Go to paragraph 9–233.
NO
Go to step 5.
5. Check for open between CB97-2 and J1-GG.
Does open exist?
YES
Repair open wire.
Go to paragraph 9–233.
NO
Replace NAV EGI circuit
breaker (CB97)
(TM 1-1520-238-23).
END OF TASK
