Fire protection

Question 1

How many fire bottles are there for the lower. Argo compartments?

Answer 1

4 bottles

AB discharge immediately
CD discharge slowly giving 150 min protection.

If CD have not discharged before touchdown, they do upon touchdown.

If the fire occurs on the ground, all 4 bottles simultaneously discharge.

Question 2

How many smoke detectors does the main deck have?

What things are actioned when the Main Deck Cargo Fire switch is pushed?

Answer 2

16

Enables main deck fire suppression
Turns off 2 packs
Configured equipment cooling to closed loop
Shuts off all airflow to main deck cargo
Shuts off all air flows and hear to lower cargo compartments.

Depressurises you’re 25000’ to reduce o2 to the fire.

Question 3

Which fire tests are automatic?

Which ones are manual?

Answer 3

Automatic:
Engine fire overheat
APU fire
Cargo Smoke

Manual:

Wheel well fire
Bleed duct leak
Main deck shut off valves
Packs 1&3 Dump Valves