TM 1-1520-238-T-7 10–180 Change 5 10–59. FUEL TRANSFER PUMP IS NOT OPERATING WITH PILOT FUEL TRANS SWITCH SET 10–59 AT TO AFT 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-5 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. Check for 28 VDC at P940–1. Is voltage present? YES Go to step 3. NO Go to step 2. 2. Check for open between P940–1 and P174–A9. Does open exist? YES Repair open wire. Go to paragraph 10–47. NO Go to step 6. 3. Check for open between P940–4 and ground. Does open exist? YES Repair open wire between P940–4 and GS500–C. Go to paragraph 10–47. NO Go to step 7. 4. Check for 28 VDC at P174–B11. Is voltage present? YES Go to step 5. NO Go to step 9. 5. Check for open between: P174–B3 and P191–A3, P174–B2 and 191–A4. Does open exist? YES Repair open wire. Go to paragraph 10–47. NO Go to step 6. 6. Check for open between (A179): J1–A3 and J1–A4. Does open exist? YES Replace CPG FUEL panel (TM 1-1520-238-23). NO Replace pilot FUEL panel (TM 1-1520-238-23). 7. Have assistant detach fuel transfer air control valve air inlet lines. On pilot FUEL panel, verify that TRANS switch is set at TO AFT. Have assistant check air flow. Is air flow present? YES Go to step 8. NO Refer to TM 1-1520-238-T-5 to troubleshoot pressurized air system.