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APU Fire

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APU Fire Panel

Description

The APU compartment has a fire protection system, with:

  • A fire detection system
  • One extinguisher bottle that discharges extinguisher agent
  • An APU Fire panel, with assigned pushbuttons. These pushbuttons can be used to isolate the APU from the other aircraft systems, and control fire extinguishing.
  • Visual and aural alerts.

Usage

APU FIRE pb

  • Nominal position: Dark
    • No fire is detected.
  • Normal position: Illuminated
    • Fire is detected in the APU compartment.
    • Associated with the following ECAM warning: APU FIRE (Refer to Procedure)
    • The light remains on, until the fire is extinguished, regardless of the position of the APU FIRE pb.
  • Guard open, Pushed out
    • All associated systems are isolated from the APU
    • The aural fire warning stops
    • The fire extinguishing system is armed, the bottle is ready to discharge.

AGENT pb

  • OFF
    • The fire extinguisher bottle is not armed.
  • SQUIB
    • The squibs of the fire extinguisher bottle are armed. The fire extinguisher bottle is ready to discharge extinguisher agent.
    • When pressed, the extinguisher bottle discharges and the SQUIB light goes off.
  • DISCH
    • The fire extinguisher bottle discharges or is empty.

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