Fire Protection

Question 1

Pulling the engine fire switch up:

Answer 1

● Closes both the engine fuel shutoff valve and the spar fuel shutoff valve.
● Closes the engine bleed air valve resulting in loss of wing anti-ice to the affected wing and closure of bleed air operated
pack valve.
● Trips the generator control relay and breaker.
● Closes the hydraulic fluid shutoff valve. The engine driven hydraulic pump LOW PRESSURE light is deactivated
● Disables thrust reverser for the related engine.
● Allows the engine fire switch to be rotated for discharge.
● Arms one discharge squib on each engine fire extinguisher bottle

Question 2

Pulling the APU Fire switch up:

Answer 2

● Provides backup for the automatic shutdown feature.
● Deactivates the fuel solenoid and closes the APU fuel shutoff valve.
● Closes the APU bleed air valve.
● Closes the APU air inlet door.
● Trips the APU generator control relay and breaker.
● Allows the APU fire switch to be rotated for discharge.
● Arms the APU fire extinguisher bottle squib.