TM 1-1520-238-T-7
10–122
10–30. ENGINE 1 FUEL CROSSFEED/SHUTOFF VALVE INDICATOR – DOES NOT MOVE
10–30
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. On pilot FUEL panel, set ENG 1 switch to ON
and CROSSFEED switch to FWD TK. Check for
28 VDC at P938-3.
Is voltage present?
YES
(AAG) Go to step 2.
(ABC) Go to step 3.
NO
Go to step 6.
2. (AAG) Check for open between P938-5 and
GS570-K.
Does open exist?
YES
Repair open wire.
Go to paragraph 10–17.
NO
Go to step 4.
3. (ABC) Check for open between P938-5 and
GS578-A.
Does open exist?
YES
Repair open wire.
Go to paragraph 10–17.
NO
Go to step 4.
4. Check for 28 VDC at P938-8.
Is voltage present?
YES
Replace engine 1 fuel
crossfeed/shutoff valve
(TM 1-1520-238-23).
NO
Go to step 5.
5. Check for 28 VDC at P1-32.
Is voltage present?
YES
Repair open wire between
(A402)J1-32 and P938-8.
Go to paragraph 10–17.
NO
Refer to TM 1-1520-238-T-6 to
troubleshoot circuit protection
system (dc emergency bus –
pilot station).
6. Check for open between P179-A2 and P938-3.
Does open exist?
YES
Repair open wire.
Go to paragraph 10–17.
NO
Replace pilot FUEL panel
(TM 1-1520-238-23).
END OF TASK
