TM 1-1520-238-T-7
10–114
Change 7
10–23. BOOST PMP ON INDICATOR – IS NOT LIGHTED WITH BOOST SWITCH SET TO ON
10–23
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. Have assistant check boost pump air exhaust
port for operating noise.
Is boost pump operating?
YES
Go to step 6.
NO
Go to step 2.
2. On pilot center circuit breaker panel, check
FUEL XFEED circuit breaker.
Does circuit breaker stay closed?
YES
Go to step 3.
NO
Go to paragraph 10–22 (ADA),
10–35E (ADB) to troubleshoot
FUEL XFEED circuit breaker.
3. Check for 28 VDC at P242-A.
Is voltage present?
YES
Go to step 4.
NO
Go to step 10.
4. Check for open wire between P242-B and
GS630-A.
Does open exist?
YES
Repair open wire.
Go to paragraph 10–17.
NO
Go to step 5.
5. Have assistant remove the fuel boost pump air
line from the fuel boost pump air valve outlet.
Set BOOST switch to ON. Have assistant check
air flow.
Does air flow from valve.
YES
Replace fuel boost pump
(TM 1-1520-238-23).
NO
Replace fuel boost pump air
valve (TM 1-1520-238-23).
6. Check for open between P444-B17 and
P444-A1.
Does open exist?
YES
Replace boost pump pressure
switch (TM 1-1520-238-23).
NO
Go to step 7.
7. Check for 28 VDC at (A402)J31-A1.
Is voltage present?
YES
Go to step 8.
NO
Go to step 9.
8. Check for 28 VDC at P18-96.
Is voltage present?
YES
Refer to TM 1-1520-238-T-6 to
troubleshoot pilot
caution/warning system.
NO
Repair open wire between:
(A402)J31-B17 and
(A402)TB2-13-W,
(A402)TB2-13–T and
(A402)J15-B19,
P438-B19 and P18-96.
Go to paragraph 10–17.
