Fire panel.

I finally finished drawings of the fire panel with cannon plugs and put together a fire panel pin-out diagram.

Overhead fire panel on A320 family aircraft consist of three guarded fire detection push button indicators. Two are for ENG 1 and 2 and one for APU (auxiliary power unit). Next to them are five extinguishing system Agent indicator switches (two per engine) and three test buttons.

 

You my noticed you can find two different types of fire panel on A320 family aircraft. Older type, represented above and newer type below.

I only know about visual differences on panel and fire push buttons. With the older panel fire button relations are written directly on the buttons like ENG 1 FIRE with PUSH. On the newer panel type all fire push buttons are identical, with FIRE PUSH inscriptions. ENG 1 (2) or APU button relations are written on the panel itself.

 

FUNCTION

  •  The fire push button red light will come on when the fire warning for the corresponding engine or apu is activated, regardless of the fire push button position.
  • When corresponding engine fire push button is pushed and popped out it will :
    – Silence the fire warning sound
    – Arm the fire extinguisher squibs
    – Close the hydraulic fire shut off valve
    – Close the low-pressure fuel valve
    – Close the pack flow control valve
    – Close the engine bleed valve
    – Deactivate the IDG
    – Cut off the FADEC power supply
  • When fire push button is pushed and popped out, both corresponding AGENT 1 and 2 indicator switches become active and white “SQUIB” lights up. With a push the corresponding engine fire extinguish bottle agent will discharge.
    Amber “DISCH” will light up when its fire extinguisher bottle has lost pressure.
  • When APU fire push button is pushed and popped out it will :
    – Shut down APU
    – Silence the fire warning sound
    – Arm the fire extinguisher squib on APU
    – Close the low-pressure fuel valve
    – Shut off the APU fuel pump
    – Close the APU bleed valve with X bleed valve and deactivate the APU generator.
  • When APU fire push button is pushed and popped out corresponding AGENT indicator switch becomes active with white “SQUIB”. With a push the APU fire extinguish bottle agent will discharge. Amber “DISCH” will light up when fire extinguisher bottle has lost pressure.

FCOM Fire Protection 26.00

Fire panel.
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