TM 1-1520-238-T-7 (11–423 blank)/11–424 Change 5 11–124. ENG WARN CIRCUIT BREAKER – DOES NOT STAY CLOSED 11–124 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 Non–transparent barrier removed Access provisions – L325, T290L, T290R, T250L and T250R doors open 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 P469 from (A326)J2. Check for short between P469–A10 and ground. Does short exist? YES Go to step 2. NO Go to step 3. 2. Detach P463 from (A76)J1. Check for short between P469–A10 and ground. Does short exist? YES Repair shorted wire between P469–A10 and P463–N. Go to paragraph 11–88. NO Refer to TM 1-1520-238-T-6 to troubleshoot circuit protection system (dc emergency bus – pilot station). 3. (AAV)Detach: P469 from (A326)J2, P435 from (A326)J7. Check for short between (A329)J1–D and ground. Does short exist? YES Repair shorted wire between (A326): TB1–51–F and J2–A18. Go to paragraph 11–88. NO Go to step 4. 4. Detach: P469 from (A326)J2, P435 from (A326)J7. Check for short between (A326)J7–A15 and ground. Does short exist? YES Repair shorted wire between (A326): J7–A15 and TB1–51–D, TB1–51–E and J2–A10. Go to paragraph 11–88. NO Go to step 5.