Fire System

Question 1

What happens if a fire loop senses a fault?

Answer 1

System shuts down that loop and uses the other loop normally

FIRE DET 1/2/3 or APU FAULT

Question 2

What happens if both fire loops sense faults?

Answer 2

FIRE DET 1/2/3 FAIL on EAD

Question 3

What happens if APU fire is sensed?

Answer 3

Shuts down APU
APU generator is deenergized
APU fuel valve closed
APU bleed valve closes

Question 4

What happens when engine fire handle is pulled?

Answer 4

Disconnects gen field
Closes fuel shutoff valve
Closes hydraulic shutoff valve
Closes bleed PRV
Arms the squibs

Question 5

What happens when Cabin Air switch is selected to OFF?

Answer 5

Auto- shuts down packs 2 & 3, closes cargo zone shutoff valve

Manual- closes cargo zone shutoff valve, must manually turn packs off per the QRH