Fire Protection

Question 1

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

Answer 1

Shuts the engine down

Yes, locked unless there is a fire indication

Question 2

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

Answer 2

Yes, both

Question 3

What does pulling fire switch do? (5)

Answer 3

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

Question 4

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

Answer 4

30sec

Question 5

Both loops needed to detect for overheat?

Answer 5

Yes

Question 6

Is APU fire switch locked without a fire?

Answer 6

Yes

Question 7

How many fire bottles for APU?

Answer 7

1

Question 8

Does APU automatically shut down with a fire?

Answer 8

Yes

Question 9

What does pulling APU fire switch do? (6)

Answer 9

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

Question 10

When is APU fire bottle automatically discharged?

Answer 10

With APU fire on ground with both engines shutdown

Question 11

If a detection loop fails what happens?

Answer 11

Auto configure to use other loop

Question 12

If dual loop failure what shows and how fix?

Answer 12

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

Question 13

How many smoke detection units in each cargo compartment?

Answer 13

two

Question 14

Type of smoke detectors?

Answer 14

Photoelectric

Question 15

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

Answer 15

two

80min later

Question 16

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

Answer 16

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

Question 17

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

Answer 17

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

Question 18

Will high brake temps trigger wheel well fire indication?

Answer 18

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

Question 19

Any extinguishing system for wheel well fire?

Answer 19

No, must lower gear

Question 20

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

Answer 20

20min

Question 21

How many loops in fire detection system?

Answer 21

Dual loops