A320 Engine & APU Fire Controls

A320 Engine & APU Fire Controls
by jerome meriweather

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Flight Deck Photos and/or Graphic Representation

Engine 1 or 2 Fire Switch ( guarded )
When released out, an electrical signal:

Cancels aural warning
Arms squibs
Deactivates generator
Closes the following valves
- Fuel LP
- Engine fuel return
- Hydraulic bleed
- Pack flow control

ENG 1 or 2 Fire Lights - Illuminates independently of the switch position as long as the respective Engine Fire warning is activated.

Engine Agent 1 or 2 Switch
Arms when the corresponding ENG FIRE switch is released out. SQUIB lights illuminate to facilitate identification of the agent switch to be activated. When the AGENT switch is pushed momentarily:

Bottle is discharged
Related DISCH light illuminates

ENG 1 or 2 TEST Switch
Test the fire detection and extinguishing system operation.

Activates ECAM ENG FIRE warning
Activates continuous chime
Illuminates the following:
- Flashing MASTER WARN lights
- ENG FIRE switch
- SQUIB lights
- DISCH lights
- FIRE lights on engine start and ignition panel

APU Fire Switch ( guarded )
When released out:

Cancels aural warning
APU shuts down
Squib is armed
Squib light illuminates
Fuel LP valve is closed
APU bleed and crossbleed valves are closed
APU generator is deactivated

APU Fire Light - Illuminates independently of switch position when the APU fire warning is activated.

APU Agent Switch
Armed by pushing the APU FIRE switch. SQUIB light illuminates. When the AGENT switch is pushing momentarily:

Bottle is discharged
DISCH light illuminates

APU TEST Switch
Tests fire detection and extinguishing system operation.
Does not cause automatic shutdown of APU.

Activates ECAM APU FIRE warning
Activates continuous chime
Illuminates the following:
- Flashing MASTER WARN lights
- APU FIRE switch on APU FIRE Panel
- SQUIB light
- DISCH light