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Boeing 757 Technical > Fire Protection > Flashcards

Flashcards in Fire Protection Deck (21):
1

What does pulling the engine fire switch do? are they locked?

Shuts the engine down
Yes, locked unless there is a fire indication

2

Do both detection loops need to be activated to detect a fire?

Yes, both

3

What does pulling fire switch do? (5)

- Fuel spar and engine valves close
- Bleed air valve close
- Shuts off hydraulic pump and depressurises it
- Generator field breaker trips
- Fire bottles arm

4

If fire not out after how many seconds before discharging second bottle?

30sec

5

Both loops needed to detect for overheat?

Yes

6

Is APU fire switch locked without a fire?

Yes

7

How many fire bottles for APU?

1

8

Does APU automatically shut down with a fire?

Yes

9

What does pulling APU fire switch do? (6)

APU fuel valve close
APU bleed air valve closes
APU shuts down (if auto system didn't work)
Air inlet door closes
Gen breaker trips
Fire bottle arms

10

When is APU fire bottle automatically discharged?

With APU fire on ground with both engines shutdown

11

If a detection loop fails what happens?

Auto configure to use other loop

12

If dual loop failure what shows and how fix?

FIRE/OVHT SYS EICAS, reset system with system fail reset switch on aft centre consol

13

How many smoke detection units in each cargo compartment?

two

14

Type of smoke detectors?

Photoelectric

15

How many fire bottles for cargo compartment? When deploy the second one?

two
80min later

16

What happens when AFT cargo compartment fire arm switch to arm? (3)

- Arms the bottles
- Turns of right recirc fan
- Closes associated cargo compartment heat valve

17

The FWD cargo fire arm switch does what when armed? (3)

- Arms the bottles
- both recirc fans turned off
- Associated cargo comp heat valve closed

18

Will high brake temps trigger wheel well fire indication?

No, only high enough temps from an actual fire will set it off

19

Any extinguishing system for wheel well fire?

No, must lower gear

20

If must retract gear (for perf) after wheel well fire has gone out how long before retract?

20min

21

How many loops in fire detection system?

Dual loops