TM 1-1520-238-T-7 10–258 10–103. FUEL TRANS CIRCUIT BREAKER – DOES NOT STAY CLOSED WITH EXT TNK 10–103 SWITCH SET TO ON 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 1-1520-238-23 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 short between (A131): J1–A1 and chassis ground, J1–B4 and chassis ground. Does short exist? YES Replace pilot FUEL panel (TM 1-1520-238-23). NO Go to step 2. 2. Attach positive meter lead to P174–A1 and check for short. Does short exist? YES Go to step 4. NO Go to step 3. 3. Check for short between (L14)J1–1 and ground. Does short exist? YES Replace auxiliary tank pressure valve (TM 1-1520-238-23). NO Repair shorted wire between P174–B4 and P243–1. Go to paragraph 10–100. 4. Check for short between (L5)J1–1 and ground. Does short exist? YES Replace left wing auxiliary fuel shutoff valve (TM 1-1520-238-23). NO Go to step 5. 5. Check for short between (L4)J1–1 and ground. Does short exist? YES Replace right wing auxiliary fuel shutoff valve (TM 1-1520-238-23). NO Go to step 6. 6. Detach P478 and P419. Check for short between (A402)J21–B19 and ground. Does short exist? YES Repair shorted wire between (A402): J21–B19 and TB2–11–L, J13–A7 and TB2–11–J, J17–B10 and TB2–11–K. Go to paragraph 10–100. NO Repair shorted wire between: P174–A1 and P439–B19, P419–A7 and P141–1, P478–B9 and P142–1. Go to paragraph 10–100. END OF TASK