TEST Switch
Tests fire detection and extinguishing system operation.
Automatic shutdown on ground does not occur during Test.

• 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

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

• Bottle is discharged
• DISCH light illuminates

Fire Switch ( Guarded )
When released out:

• Cancels aural warning
• APU shuts down
• Squib is armed
• Squib light illuminates
• Fuel LP valve is closed
• APU fuel pumps off (AFT and FWD )
• APU bleed and crossbleed valves are closed
• APU generator is deactivated

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