B747 CHAPTER 26

26

1. FIRE PROTEC:

                 ENG: FIRE PROTEC + EXTINGUISH SUPP BY 28VDC BATT AND HOT BUS

                     APU: SAME AS ENG’S

                     W/W: OVERHEAT DET SUPP BY 115VAC FROM AC ESS + 28VDC FROM BAT BUS

2. FIRE DET LOGICS DONE BY RELAYS

3. ENG FIRE HANDLE PULLED:

                                            FUEL VLV CLOSE

                                            PYLON VLV CLOSE

                                            HYD S/O CLOSE

                                            GEN TRIP WITH MAX 10 SEC DELAY

                                            HYD PUMP DEPRESS

                                            FIRE EXTINGUISH ARM

4. BOTTLE LOW PRESS RESET DONE BY CB (MUST RESET AFTER BOTTLE CHANGE)

5. DET CARDS CONSIST OF:

                                            SUPP LOOPS

                                            OUTPUT TO IND AND WARN SYS

                                            FAULT AND FIRE AND SHORT CIRCUIT DISCRIMINATOR