Fire Detection And Suppression

Question 1

Pulling the APU FIRE WARNING SWITCH does what?

Answer 1

• Deactivates fuel solenoid and closes the APU fuel shutoff valve
• closes APU BLEED AIR VALVE
• closes APU AIR INLET DOOR
  - trips APU GENERATOR
• allow APU FIRE WARNING SWITCH to be rotated for discharge
• arms squib

Question 2

What happens when the engine firewarning switch is pulled

Answer 2

• Arms squib
• closes fuel and hydraulic shut off valve
• bleed air valves
  - trips generator
• Deactivates engine driven hydraulic low pressure light
• allows engine fire switch to rotate
• Disable thrust reverser