TM 55-1520-240-T FAILURE SYMPTOM LIST (Continued) MASTER CAUTION SYSTEM SYMPTOM TASK BOTH MASTER CAUTION LIGHTS ARE ON BUT ONE IS BRIGHT AND ONE IS DIM 9-18.3 CAUTION PNL CIRCUIT BREAKER WILL NOT STAY CLOSED 9-18.3 LIGHTS DO NOT COME ON WHEN CAUTION LIGHTS TEST SWITCH IS AT TEST 9-18.3 SYMPTOM TASK AVIONIC COOLING FAN DC CIRCUIT BREAKER WILL NOT STAY CLOSED 9-19.3 SYMPTOM TASK COPILOT CLOCK CIRCUIT BREAKER DOES NOT STAY CLOSED 9-22.3 COPILOT'S CLOCK DISPLAY DOES NOT INDICATE 88:88 WHEN SELECT BUTTON PRESSED 9-22.3 SYMPTOM TASK MASTER CAUTION PANEL CAPSULES AND MASTER CAU- TION LIGHTS ARE DIM WHEN ELECTRICAL POWER APPLIED OR WHEN CAUTION LIGHT SWITCH SET TO BRIGHT 9-18.3 MASTER CAUTION PANEL LIGHTS DO NOT COME ON WHEN BATTERY SWITCH SET TO ON 9-18.3 AVIONICS COOLING FAN SYMPTOM TASK AVIONIC COOLING AC CIRCUIT BREAKER WILL NOT STAY CLOSED 9-19.3 ANTICOLLISION LIGHT (AVIM) SYMPTOM TASK ANTI-COLLISION LIGHT FAILS AVIM TEST 9-20.3 MASTER CAUTION PANEL SYMPTOM TASK MASTER CAUTION PANEL FAILS AVIM TEST (WITHOUT  74) 9-21.3 MASTER CAUTION PANEL FAILS AVIM TEST (WITH  74) 9-21.6 CLOCK (WITH  17) SYMPTOM TASK PILOT CLOCK CIRCUIT BREAKER DOES NOT STAY CLOSED 9-22.3 PILOTS CLOCK DISPLAY DOES NOT INDICATE 88:88 WHEN SELECT BUTTON PRESSED 9-22.3 SYMPTOM TASK MASTER CAUTION PANEL LIGHTS DO NOT GO BRIGHT WHEN DOME SELECT SWITCH SET TO WHITE 9-18.3 MASTER CAUTION PANEL LIGHTS OR MASTER CAUTION LIGHTS WILL NOT DIM 9-18.3 PILOT'S AND COPILOT'S MASTER CAUTION LIGHT WILL NOT GO OUT 9-18.3 PILOT'S OR COPILOT'S MASTER CAUTION LIGHTS DO NOT COME ON WHEN ELECTRICAL POWER IS APPLIED 9-18.3 SYMPTOM TASK WEAK OR NO AIR FLOW IS FELT FROM AVIONIC COOLING FAN 9-19.3 Change 19  9-2.5