TM 1-1520-238-T-7
10–120
10–28. ENGINE 2 FUEL CROSSFEED/SHUTOFF VALVE INDICATOR – DOES NOT MOVE
10–28
TO FORWARD POSITION
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
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. Check for 28 VDC at (A131)J2-A9.
Is voltage present?
YES
Go to step 2.
NO
Go to step 3.
2. With P179 attached, check for 28 VDC at
P939-1.
Is voltage present?
YES
Go to step 6.
NO
Repair open wire between:
P939-1 and (A402)TB2-13-B,
(A402)TB2-13-A and P179-A9.
Go to paragraph 10–17.
3. Check for 28 VDC at P174-B19.
Is voltage present?
YES
Replace pilot FUEL panel
(TM 1-1520-238-23).
NO
Go to step 4.
4. Check for 28 VDC at P191-A1.
Is voltage present?
YES
Go to step 5.
NO
Go to step 7.
5. Check for open between (A179):
J1-A2 and J1-A1.
Does open exist?
YES
Replace CPG FUEL panel
(TM 1-1520-238-23).
NO
Repair open wire between
P191-A2 and P174-B19.
Go to paragraph 10–17.
6. Check for open between P939-5 and GS541-M.
Does open exist?
YES
Repair open wire.
Go to paragraph 10–17.
NO
Replace engine 2 fuel
crossfeed/shutoff valve
(TM 1-1520-238-23).
7. Check for 28 VDC at P1-32.
Is voltage present?
YES
Repair open wire between:
P191-A1 and P429-B14,
(A402)J23-B14 and
(A402)TB3-4-K,
(A402)TB3-4-L and
(A402)J1-32. Go to
paragraph 10–17.
NO
Refer to TM 1-1520-238-T-6 to
troubleshoot circuit protection
system (dc emergency bus –
pilot station).
END OF TASK
