TM 1-1520-238-T-7 Change 5 11–383 11–97. STAB AUTO DC CIRCUIT BREAKER – DOES NOT STAY CLOSED 11–97 Tools: Nomenclature Part Number Tool Kit, Electrical SC518099CLA06 Repairer’s Multimeter, Digital AN/PSM-45 Extractor, Relay CTJ-RO6 Personnel Required: 68X Armament/Electrical Systems Repairer References: 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. Open STAB MAN DC (A76)CB6, STAB AUTO DC (A76)CB3, STAB AUTO AC (A76)CB2 and ENG WARN (A76)CB52 circuit breakers. Detach P2 from (A402)J2. Check for short between (A402)P2–f and ground. Does short exist? YES Refer to TM 1-1520-238-T-6 to troubleshoot circuit protection system (dc essential bus 3 – pilot station). NO Go to step 2. 2. Detach (A402): P427 from J28, P431 from J27. Check for short between J2–f and ground. Does short exist? YES Repair shorted wire between: TB2–22–A and J2–f, TB2–22–C and J27–B11, TB2–22–D and J27–B9, TB2–22–E and J28–C, TB2–22–F and J28–D. Go to paragraph 11–88. NO Go to step 3. 3. Check for short between P431–B9 and ground. Does short exist? YES Go to step 4. NO Go to step 5. 4. Detach P989 from (A638)J1. Check for short between P431–B9 and ground. Does short exist? YES Repair shorted wire between P989–E and P431–B9. Go to paragraph 11–88. NO Replace STAB CONT UNIT 2 (A638) (TM 1-1520-238-23). 5. Check for short between P431–B11 and ground. Does short exist? YES Go to step 6. NO Go to step 7. 6. Detach P985 from (A637)J1. Check for short between P431–B11 and ground. Does short exist? YES Repair shorted wire between P985–E and P431–B11. Go to paragraph 11–88. NO Replace STAB CONT UNIT 1 (A637) TM 1-1520-238-23). 7. Detach P485 from (A323)J7. Check for short between P427–D and ground. Does short exist? YES Repair shorted wire between P485–E and P427–D. Go to paragraph 11–88. NO Go to step 8.