FIRE EXTINGUISHER

FWD/AFT CARGO FIRE DETECTION/EXTINGUISHER BUTTON (Guarded)

Button illuminates if smoke is detected in the respective cargo compartment.

FIRE DETECTION SYSTEM TEST BUTTON (Momentary position)

• Tests the engine fire, APU fire, and cargo smoke detection systems

• Press and hold the test button for a minimum of 3 seconds, but not more than 10 seconds if the APU is running or it will automatically shutdown the APU.

• Ventilation outflow valve closes – only when bleed air is being provided by the engines or the APU

APU FIRE EXTINGUISHER BUTTON (Guarded)

• Illuminates in the event of a fire when APU EMER STOP button is pressed.

• Illumination turns OFF when the fire input from the APU fire detectors disappears.

• APU FIRE EXTINGUISHER button pressed:

  • Discharges the APU fire bottle.

  • Shuts down the APU through the APU FADEC

  • Closes the APU fuel shutoff valve (SOV)