TM 1-1520-238-T-7 Change 5 10–177 10–57. FUEL LOW FWD INDICATORS – ARE NOT LIGHTED WITH PILOT FUEL QUANTITY 10–57 INDICATOR FWD VERTICAL DISPLAY INDICATING BETWEEN 20 AND 16 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 Equipment Conditions: Ref Condition TM 1-1520-238-23 Access provisions – L40 door removed 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. With power off, check resistance between P401–6 and P401–7. Is resistance 360 to 480 ohms? YES Go to step 2. NO Go to step 3. 2. Check for open between P401–14 and P18–21. Does open exist? YES Repair open wire. Go to paragraph 10–47. NO Go to step 5. 3. Check resistance between P915–A15 and P915–A14. Is resistance 360 to 480 ohms? YES Repair open wire between: P401–6 and J915–A15, P401–7 and J915–A14. Go to paragraph 10–47. NO Go to step 4. 4. Check resistance between (A58): J1–8 and J1–9. Is resistance 360 to 480 ohms? YES Repair open wire between: P263–8 and P915–A14, P263–9 and P915–A15. Go to paragraph 10–47. NO Adjust fuel low forward sensor on aft fuel quantity transmitter in forward fuel cell (TM 1-1520-238-23). 5. Check for open between P18–21 and ground. Does open exist? YES Replace SDC (TM 1-1520-238-23). NO Refer to TM 1-1520-238-T-6 to troubleshoot the pilot caution/warning system. END OF TASK