TM 1-1520-238-T-5
8–102
8–35.
PILOT FUEL QUANTITY INDICATOR VERTICAL SCALE INDICATORS OR DIGITAL
8–35
READOUTS – DO NOT INDICATE EXISTING FUEL 20 POUNDS
Tools:
Nomenclature
Part Number
Tool Kit, Electrical
SC518099CLA06
Repairer’s
Multimeter, Digital
AN/PSM-45
Personnel Required:
68X
Armament/Electrical Systems Repairer (2)
References:
TM 1-1520-238-T-7
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 instrument panel check FUEL quantity
indicator for fuel indications.
Does either vertical scale indicator or digital
readouts indicate existing fuel 20 pounds?
YES
Replace pilot FUEL quantity
indicator. (TM 1-1520-238-23).
NO
Go to step 2.
2. Check for 0 to 5 VDC at:
P253–18 and P253–19,
P253–22 and P253–23.
Is voltage present?
YES
Replace pilot FUEL quantity
indicator (TM 1-1520-238-23).
NO
Go to step 3.
3. Check for open between P937–G and ground.
Does open exist?
YES
Repair open wire between
GS252–C and P937–G.
Go to paragraph 8–10.
NO
Go to step 4.
4. Check for 28 VDC at P937–H.
Is voltage present?
YES
Go to step 5.
NO
Go to step 7.
5. Check for 0 to 5 VDC at:
P467–A13 and P467–A14,
P467–A15 and P467–A14.
Is voltage present?
YES
Repair open wire between:
(A326)TB1–1–B and P253–23,
(A326)TB1–1–C and P253–19,
(A326)TB1–1–F and P253–22,
(A326)TB1–1–K and P253–18.
(A326):
J5–A13 and TB1–1–E,
J5–A14 and TB1–1–A,
J5–A15 and TB1–1–J.
Go to paragraph 8–10.
NO
Go to step 6.
6. Check for open between:
P467–A13 and P937–L,
P467–A14 and P937–J,
P467–A15 and P937–U.
Does open exist?
YES
Repair open wire.
Go to paragraph 8–10.
NO
Refer to TM 1-1520-238-T-7 to
troubleshoot fuel quantity
indication/transfer system.
