TM 1-1520-238-T-7
10–141
10–45. FUEL BOOST SWITCH – DOES NOT STAY ON WITH CROSSFEED SWITCH SET
10–45
TO AFT TK
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
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 P174-B19.
Does open exist?
YES
Go to step 4.
NO
Go to step 2.
2. Check for 28 VDC at P191-A1.
Does open exist?
YES
Go to step 5.
NO
Go to step 3.
3. Check for 28 VDC at (A76)P1-32.
Does open exist?
YES
Repair open wire between:
(A402)J1-32 and
(A402)TB3-4-L,
(A402)J23-B14 and
(A402)TB3-4-K,
P429-B14 and P191-A1.
Go to paragraph 10–17.
NO
Refer to TM 1-1520-238-T-6 to
troubleshoot circuit protection
system (dc emergency bus –
pilot station).
4. On pilot FUEL panel, set CROSSFEED switch to
AFT TK. Check for open between (A131):
J1-B19 and J1-B5.
Does open exist?
YES
Go to step 6.
NO
Repair open wire between
(A131)S2-8 and chassis ground.
Go to paragraph 10–17.
5. On CPG FUEL panel, set ORIDE switch to PLT.
Check for open between (A179):
J1-A1 and J1-A2.
Does open exist?
YES
Go to step 7.
NO
Repair open wire between
P191-A2 and P174-B19.
Go to paragraph 10–17.
6. Check for open between (A131):
S1-5 and J1-B19,
S2-7 and J1-B5,
S2-1 and S2-7,
S2-1 and S1-1,
S1-3 and S1-4.
Does open exist?
YES
Repair open wire.
Go to paragraph 10–17.
NO
Replace pilot FUEL panel
(TM 1-1520-238-23).
