Fire protection 747-400

Question 1

How fire extinguishers for the APU?

Answer 1

1

Question 2

If you experience a FWD cargo fire, and extinguishers operate, and then you have another AFT cargo fire, what are your options?

Answer 2

To land immediately. No extinguishers available any more.

Question 3

What does pushing the cargo depress dischg switch do?

Answer 3

Starts a controlled cabin depress to 25,000Ft.

Question 4

What does pushing the Main Deck Cargo Fire arm switch do?

Answer 4

1) Fire suppression
2) 2 Packs off
3) All airflow to all cargo compartments are off.

Question 5

What does pushing the Main Deck Cargo Fire arm switch do?

Answer 5

1) Fire suppression
2) 2 Packs off (no air to lower cargo)
3) All airflow to all cargo compartments are off.
4) Master trim air closed.

FWD: Closes overboard valve
AFT: Shut off aft cargo heat

Question 6

When is the fire bell inhibited?

Answer 6

During takeoff from v1 until 400ft ra or 25 sec after V1

Question 7

When is the fire bell inhibited?

Answer 7

During takeoff from v1 until 400ft ra or 25 sec after V1, whichever is sooner.

Question 8

What happends when you pull the APU fire switch

Answer 8

1) APU Shutdown
2) APU Fuel valve closes
3) APU Gen field and breakers trip
4) APU Bleed valve closes
5) APU fire bottle squib arms
6) Firebell / wheel well fire horn silenced.

Question 9

What happens when an engine fire handle switch is pulled?

Answer 9

1) Engine bleed valve closes
2) Hyd shutoff valve closes
3) Generator field relay and generator breaker trip
4) Arms both related engine fire extinguisher squibs

Question 10

Pushing the FWD cargo arm switch does?

Answer 10

1) Packs 2 and 3 shut down automatically
2) Equipment cooling system override mode
3) Forward overboard valve closed.