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  • Chapter 9: Engine Fire Protection Systems › APU Fire Detection & Extinguishing System

    Fire Detection & Extinguishing System The APU fire protection system is similar in design to engine fire protection systems, but there are some differences. The APU is often operated with no personnel in the flight deck and; the APU fire protection ... system can operate in an unattended mode on the ground with the engines not running. If there is an APU fire in the unattended mode, the fire extinguisher discharges automatically. The APU operates in the attended mode when at least…

  • Chapter 9: Engine Fire Protection Systems › Boeing 777 Aircraft Fire Detection & Extinguishing System › Engine Fire Switches

    Engine Fire Switches The engine fire panel is in the flight deck on the P8 aisle stand. The engine fire panel has a fire switch for each engine and a discharge light for each fire bottle. [Figure ... engine fire switch has four functions: Gives an indication of an engine fire, • Stops the engine, • Isolates the engine from the aircraft systems, and • Controls the engine fire extinguishing system. The fire switch assembly incorporates a solenoid that locks…

  • Chapter 17: Fire Protection Systems

    Combustion heater manufacturers also produce maintenance guidelines that should be followed. Intervals between the performance of maintenance items and the time between overhauls must be followed to help ensure a properly functioning heater is available when it is needed. Inspection ... combustion heater should be performed on schedule as provided by the manufacturer or whenever a malfunction is suspected. Inlets and outlets should be clear. All controls should be checked for freedom of operation and function. Close observation for any sign…