TM 1-1520-238-T-6 9–548 9–263. CIRCUIT PROTECTION SYSTEM (DC EMERGENCY BUS – PILOT STATION) – 9–263 MAINTENANCE OPERATIONAL CHECK(CONT) ENG INST FIRE DETR ENG 1 FIRE DETR ENG 2 FIRE DETR APU FIRE EXTGH PLT FIRE EXTGH CPG FIRE EXTGH APU FUEL VLV ACTR FUEL FILL FUEL APU ENG WARN FUEL XFEED COMM ADF COMM IFF COMM UHF AM COMM KY 28 COMM VHF FM COMM ICS PITOT HTR RDR WARN RTR BRK APU HOLD JETT CHAFF CENTER CENTER M69-251 AFT ECS CAB LT SRCH / LDG LT SRCH / LDG CONTR LT CAUT LT UTIL SEC EMERG HYD TRIM RDR ALT STBY ATTD THROT ENG CUT ENG LVR ENG START Figure 9–191. Pilot Circuit Breaker Panels