TM 1-1520-238-T-7 10–194 10–69. NITROGEN INERTING SYSTEM – IS NOT OPERATING 10–69 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 Access provisions – R200 panel removed WARNING To prevent bodily injury, nitrogen inerting system pressure must be relieved prior to opening fuel service port covers. 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. NOTE To relieve nitrogen inerting system pressure, refer to TM 1-1520-238-23. 1. On utility receptacle circuit breaker box, close NITROGEN INERT circuit breaker CB94. Does circuit breaker stay closed? YES Go to step 3. NO Go to step 2. 2. Detach P1085. Open NITROGEN INERT circuit breaker. Check for short between CB94–2 and ground. Does short exist? YES Repair shorted wire. Go to paragraph 10–67. NO Replace NIU (TM 1-1520-238-23). 3. Check for 115 VAC at P1085–1. Is voltage present? YES Go to step 4. NO Go to step 5. 4. Check for open between P1085–2 and GS442–B. Does open exist? YES Repair open wire. Go to paragraph 10–67. NO Replace NIU (TM 1-1520-238-23). 5. Check for open between CB94–1 and CB94–2. Does open exist? YES Replace NITROGEN INERT circuit breaker (CB94) (TM 1-1520-238-23). NO Go to step 6. 6. Check for open between: CB94–1 and CB6–B1, CB94–2 and P1085–1. Does open exist? YES Repair open wire. Go to paragraph 10–67. NO Refer to TM 1-1520-238-T-6 to troubleshoot ac electrical power generation. END OF TASK