TM 1-1520-238-T-7
10–257
10–102. AUXILIARY FUEL TANK PRESSURE CONTROL VALVE – DOES NOT OPEN
10–102
WITH EXT TK SWITCH SET TO ON
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-T-6
TM 1-1520-238-23
Equipment Conditions:
Ref
Condition
TM 1-1520-238-23
Access provisions –
L200 cover removed,
T250L, T250R,
T290L, T290R, and
L325 doors 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 pilot FUEL panel EXT TK switch is set to ON
position, check for 28 VDC at P243–1.
Is voltage present?
YES
(ABC) Go to step 3.
(AAG) Go to step 2.
NO
Go to step 4.
2. (AAG) Check for open between P243–3 and
GS572–F.
Does open exist?
YES
Repair open wire.
Go to paragraph 10–100.
NO
Replace auxiliary tank pressure
valve
(TM 1-1520-238-23).
3. (ABC) Check for open between P243–3 and
GS576–A.
Does open exist?
YES
Repair open wire.
Go to paragraph 10–100.
NO
Replace auxiliary tank pressure
valve
(TM 1-1520-238-23).
4. Check for 28 VDC at P174–B11.
Is voltage present?
YES
Go to step 5.
NO
Go to step 6.
5. With EXT TK switch set to ON, check for open
between (A131):
J1–B11 and J1–B4.
Does open exist?
YES
Replace pilot FUEL panel
(TM 1-1520-238-23).
NO
Repair open wire between
P174–B4 and P243–1.
Go to paragraph 10–100.
6. Check for 28 VDC at P2–D.
Is voltage present?
YES
Repair open wires between:
(A402)J2–D and (A402)J25–a,
P437–a and P174–B11.
Go to paragraph 10–100.
NO
Refer to TM 1-1520-238-T-6 to
troubleshoot circuit protection
system (dc essential bus 2 –
pilot station).
END OF TASK
