TM 1-1520-238-T-6 Change 5 9–257 9–73. LEFT AND RIGHT RED ANTI-COLLISION LIGHTS – DO NOT FLASH 9–73 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. Anti-collision lights are high intensity strobe lights. Excessive viewing of lights could cause temporary blindness. If injury occurs, seek medical aid. 1. Check for 115 VAC at P1-44. Is voltage present? YES Go to step 2. NO Go to paragraph 9–150 to troubleshoot circuit protection system (ac essential bus 1 – pilot station). 2. Check for 115 VAC at P100-B16. Is voltage present? YES Go to step 3. NO Repair open between: P100-B-16 and P457-A16, (A402)J22-A16 and (A402)J1-44. Go to paragraph 9–70. 3. Check for 115 VAC between P102-1 and P102-5. Is voltage present? YES Go to step 5. NO Go to step 4. 4. Check for open between P102-1 and P100-B18. Does open exist? YES Repair open wire. Go to paragraph 9–70. NO Replace pilot EXT LT/INTR LT panel (TM 1-1520-238-23). 5. Check for open between P102-4 and ground. Does open exist? YES Repair open wire. Go to paragraph 9–70. NO Replace anti-collision light power supply (TM 1-1520-238-23). END OF TASK