CAUTION WARNING Loop 1 Master warning/ caution light (2) Left engine fire switch Right engine fire switch APU fire switch Unlocking Solendid P310 standby power mgmt panel P105 left integration panel L R L R WEU (2) 28V DC BAT. BUS FIRE HANDLE UNLOCK ASG card (2) AIMS cabinet (2) Systems arine 629 buses Left engine fire  detection card Left fuel control switch Speaker (2) Loop 2 • Fire alarm OVHT alarm • Temp data Fault data } Fire alarm 1 MD&T Fuel spar  ignition relay MD&T Fire alarm 2 Fire warning switch L E F T 1 2 DISCH R I G H T 1 2 DISCH ENG BTL 1 DISCH ENG BTL 2 DISCH ENGINE FIRE PANEL (P8) Discharge nozzles Engine bottle discharge lights Engine fire switches Front spar (ref) Engine fire extinguishing bottles Discharge manifold Discharge nozzles Figure 9-21.  Engine fire detection system functional description. Figure 9-22.  Boeing 777 fire extinguisher container location. 9-16