TM 1-1520-238-T-7
10–234
10–88. FWD CLOSED INDICATOR – IS NOT LIGHTED WITH LVL CONT VALVES FWD
10–88
TNK SWITCH SET TO CLOSE
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-4
TM 1-1520-238-23
Equipment Conditions:
Ref
Condition
TM 1-1520-238-23
Access provision –
R160 door open
TM 1-1520-238-T-4
Maintenance headset
connected
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 refueling panel, set FUEL QTY switch to IND
ON and press FWD CLOSED indicator.
Is indicator lighted?
YES
Go to step 2.
NO
Go to step 8.
2. Apply 28 VDC at P260–1, check for 28 VDC at
P260–9.
Is voltage present?
YES
Replace refueling panel
(TM 1-1520-238-23).
NO
Go to step 3.
3. Check for open between (A58):
J1–10 and J1–11.
Does open exist?
YES
Go to step 4.
NO
Go to step 5.
4. Check for open between (A58):
J2–1 and J2–2.
Does open exist?
YES
Replace forward fuel cell fuel
level control pilot valve
(TM 1-1520-238-23).
NO
Replace forward fuel cell
fuel/defuel check valve
(TM 1-1520-238-23).
5. Apply 28 VDC at P260–1 and check for 28 VDC
at P1066–1.
Is voltage present?
YES
Go to step 6.
NO
Go to step 7.
6. Check for open between:
P1066–3 and ground,
P1066–4 and P263–10,
P263–11 and ground,
P1066–2 and P440–B19,
(A402)J16–B19 and (A402)TB2–11–E,
(A402)TB2–11–F and (A402)J31–A3,
P444–3 and P260–9.
Does open exist?
YES
Repair open wire.
Go to paragraph 10–76.
NO
Replace forward fuel cell
isolation fuel valve switch
(TM 1-1520-238-23).
