TM 1-1520-238-T-7 10–121 10–29. ENGINE 1 FUEL CROSSFEED/SHUTOFF VALVE INDICATOR – DOES NOT MOVE 10–29 TO CLOSED POSITION 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-T-8 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. Check for 28 VDC at (A131)J2-A5. Is voltage present? YES Go to step 2. NO Go to step 3. 2. With P179 attached, check for 28 VDC at P938-2. Is voltage present? YES (AAG) Go to step 5. (ABC) Go to step 6. NO Repair open wire between P179-A5 and P938-2. Go to paragraph 10–17. 3. Check for 28 VDC at P174-B17. Is voltage present? YES Replace pilot FUEL panel (TM 1-1520-238-23). NO Go to step 4. 4. Check for 28 VDC at (A322)P1-B5. Is voltage present? YES Repair open wire between J1039-B5 and P174-B17. Go to paragraph 10–17. NO Refer to TM 1-1520-238-T-8 to troubleshoot utility system. 5. (AAG) Check for open between P938-5 and GS570-K. Does open exist? YES Repair open wire. Go to paragraph 10–17. NO Go to step 7. 6. (ABC) Check for open between P938-5 and GS578-A. Does open exist? YES Repair open wire. Go to paragraph 10–17. NO Go to step 7. 7. Check for 28 VDC at P938-8. Is voltage present? YES Replace engine 1 fuel crossfeed/shutoff valve (TM 1-1520-238-23). NO Go to step 8. 8. Check for 28 VDC at P1-32. Is voltage present? YES Repair open wire between (A402): J1-32 and TB3-4-L, TB3-4-M and J24-B11. Go to paragraph 10–17. NO Refer to TM 1-1520-238-T-6 to troubleshoot circuit protection system (dc emergency bus – pilot station). END OF TASK