8 - Fire Protection

Question 1

What happens when Engine Fire Switch is pulled out? (6)

Answer 1

• closes engine and spar fuel valves
• closes engine bleed air valve
• trips off generator
• shuts off hydraulic fluid to engine-driven pump
• depressurizes engine-driven hydraulic pump
• arms fire extinguishers

Question 2

How long does the Engine Fire Warning Lights illuminate?

Answer 2

as long as an engine fire is detected

Question 3

How can you verify a fire bottle has been discharged?

Answer 3

Bottle Discharged (BTL DISCH) Light and

EICAS Advisory Message

> BTL LO (L/R) ENG (A/B)
BOTTLE LOW APU
CGO BTL DISCH

Question 4

What happens when you pull the APU Fire Switch? (6)

Answer 4

• arms fire extinguisher bottle
• closes fuel valve
• closes bleed air valve
• closes air inlet door
• trips generator fields and generator breakers
• shuts down APU (if automatic shutdown does not occur)

Question 5

Engine and APU Fire Switches are mechanically locked and unlock for a fire warning. How can Fire Switches be pulled if locked?

Answer 5

switches can be individually unlocked by pushing the FIRE OVERRIDE SWITCH beneath each Fire switch

Engine Fire switches are unlocked when the respective Fuel Control switches are in CUTOFF

Question 6

Is there any automatic fire protection on the B744?

Answer 6

APU automatically shuts down for a detected fire

On the ground, the APU extinguisher automatically discharges

Question 7

What happens when CARGO FIRE ARM Switch - MAIN is pushed? (6)

Answer 7

• enables main deck fire suppression (depressurization)
• turns off two packs
• configures equipment cooling to ‘closed loop’ and
• turns off all airflow to main deck and airflow and heat into lower cargo compartments
• closes master trim air valve
* satcom shuts down to prevent overheating

Question 8

What happens when CARGO FIRE ARM Switch - FWD or AFT is pushed? (6)

Answer 8

• turns off two packs
• arms lower cargo compartment fire extinguishers
• configures equipment cooling to ‘override mode’
• turns off all airflow and heat into lower cargo compartments
• closes master trim air valve
* SATCOM will shut down to prevent overheating

Question 9

What does CARGO FIRE DEPRESS/DISCH Switch do when pressed?

MAIN - ARMED:

FWD or AFT - ARMED:

Answer 9

initiates controlled depressurization

initiates extinguisher discharge sequence (2 immediately, 4 after a brief delay or upon touchdown)

Question 10

FWD/AFT Cargo has ____ minutes effective fire extinguishing agent?

Answer 10

334 min