TM 1-1520-238-T-7
10–116
10–24. ENGINE 2 FUEL CROSSFEED/SHUTOFF VALVE INDICATOR – DOES NOT INDICATE
10–24
CLOSED POSITION WITH ENG 2 SWITCH SET TO OFF
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-T-8
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 P429-B6.
Is voltage present?
YES
Go to step 4.
NO
Go to step 2.
2. Check for 28 VDC at P174-B18.
Is voltage present?
YES
Go to step 7.
NO
Go to step 3.
3. Check for 28 VDC at (A322)P1-B8.
Is voltage present?
YES
Repair open wire between
J1039-B8 and P174-B18.
Go to paragraph 10–17.
NO
Refer to TM 1-1520-238-T-8 to
troubleshoot utility system.
4. Check for 28 VDC at P939-2.
Is voltage present?
YES
Go to step 5.
NO
Go to step 8.
5. Check for 28 VDC at P939-8.
Is voltage present?
YES
Replace engine 2 fuel
crossfeed/shutoff valve
(TM 1-1520-238-23).
NO
Go to step 6.
6. Check for 28 VDC at P1-32.
Is voltage present?
YES
Repair open wire between:
(A402)J1-32 and
(A402)TB3-4-L,
(A402)TB3-4-J and
(A402)J5-B8,
P442-B8 and P939-8.
Go to paragraph 10–17.
NO
Refer to TM 1-1520-238-T-6 to
troubleshoot circuit protection
system (dc emergency bus –
pilot station).
7. Check for 28 VDC at (A131)J2-A7.
Is voltage present?
YES
Repair open wire between
P179-A7 and P429-B6.
Go to paragraph 10–17.
NO
Replace pilot FUEL panel
(TM 1-1520-238-23).
8. Check for 28 VDC at (A402)J5-B10.
Is voltage present?
YES
Repair open wire between
P442-B10 and P939-2.
Go to paragraph 10–17.
NO
Repair open wire between
(A402):
J23-B6 and TB2-13-E,
TB2-13-F and J5-B10.
Go to paragraph 10–17.
END OF TASK
