TM 1-1520-238-T-7
10–232
10–87. FUEL FILL CIRCUIT BREAKER – DOES NOT STAY CLOSED WITH LVL CONT
10–87
VALVES SWITCHES SET TO OPEN
Tools:
Nomenclature
Part Number
Tool Kit, Electrical
SC518099CLA06
Repairer’s
Multimeter, Digital
AN/PSM-45
Extractor, Relay
CTJ-RO6
Personnel Required:
68X
Armament/Electrical Systems Repairer
One person to assist
References:
TM 1-1520-238-T-6
TM 1-1520-238-23
Equipment Conditions:
Ref
Condition
TM 1-1520-238-23
Access provision –
R160 door open
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 refueling panel, set REFUEL VALVE switch
on refueling panel to OPEN. Attach positive
meter lead to P463–A and check for short to
ground.
Does short exist?
YES
Go to step 2.
NO
Refer to TM 1-1520-238-T-6 to
troubleshoot circuit protection
system (dc emergency bus
–pilot station).
2. Detach P260. Check for short between P463–A
and ground.
Does short exist?
YES
Go to step 3.
NO
Go to step 4.
3. Detach P429 and P444. Check for short
between:
P463–A and ground,
P260–3 and ground.
Does short exist?
YES
Repair shorted wire between:
P463–A and P429–B20, P260–3
and P444–A9.
NO
Repair shorted wire between
(A402):
J23–B20 and TB2–13–Z,
J31–A9 and TB2–13–Y.
Go to paragraph 10–76.
4. Check for short between (A57):
J1–3 and chassis ground,
J1–4 and chassis ground,
J1–7 and chassis ground,
J1–10 and chassis ground,
J1–11 and chassis ground,
J1–16 and chassis ground.
Does short exist?
YES
Replace refuel panel
(TM 1-1520-238-23).
NO
Go to step 5.
5. Check for short between P260–7 and ground.
Does short exist?
YES
Go to step 6.
NO
Go to step 9.
6. Detach P251. Check for short between P260–7
and ground.
Does short exist?
YES
Replace fuel transfer shutoff
valve (TM 1-1520-238-23).
NO
Go to step 7.
7. Detach P444. Check for short between P260–7
and ground.
Does short exist?
YES
Repair shorted wire between:
P260–7 and P251–3,
P260–7 and P444–A4.
Go to paragraph 10–76.
NO
Go to step 8.
