Engine & APU Fire Protection

Question 1

The Engine/APU Fire Protection System does what?

Answer 1

Detects fires & extinguishes fires

Question 2

The engine fire protection system also detects ?

Answer 2

Overheat conditions

Question 3

Both engines & APU have ………… loop fire detection systems

Answer 3

Dual

Question 4

Dual loops in the engines also detect ……………

Answer 4

Overheats

Question 5

Fault monitoring in the fire protection is ?

Answer 5

Continuous

Question 6

How many fire bottles protect both engines?

Answer 6

2 fire bottles protect both engines

Question 7

How many fire bottles protect the APU?

Answer 7

1

Question 8

The engine fire switches are locked to the ‘in’ position when no fire is detected. The locks are …………… operated.

Answer 8

Electrically

Question 9

Pulling the ‘Fire Handle’ switch does what?

Answer 9

1. Closes fuel valve
2. Closes bleed air valves
3. Hydraulic pump depressurised (switch shuts off hydraulic fluid & depressurises the engine driven pump)
4. Generator field breaker trips
5. Arms the squibs on each fire bottle

Question 10

The APU fire switch is operated ?

Answer 10

Electrically

Question 11

APU fire alert requires detection of fire on ……… loops?

Answer 11

Both

Question 12

If an APU fire signal is detected the APU automatically ……………?

Answer 12

Automatically shuts down

Question 13

Pulling the APU Fire Switch does what?

Answer 13

1. Fuel valve closes
2. Bleed air valve closes
3. APU shuts down (if it didn’t automatically)
4. Air inlet door closes
5. Generator field breaker trips
6. Fire bottle arms

Question 14

Is the APU fire bottle automatically or manually discharged?

Answer 14

Manually

Question 15

If the a/c is on the ground with both engines shutdown & the APU operating, how many loops are required to detect a fire?

Answer 15

Only one detection loop is necessary to detect a fire

Question 16

If both engines are shutdown & the APU is running & a fire is detectedin the APU, the APU will automatically shutdown and the fire bottle will ……………….?

Answer 16

Automatically discharge

Question 17

An APU fire can be extinguished manually from the flight deck or ?

Answer 17

By by using the fire controls on the nose gear panel

Question 18

What do you do if the fire switch fails to unlock?

Answer 18

Use the fire override switch (push & hold the override switch)

Question 19

What happens to the fire detection system if there’s a loop failure?

Answer 19

Dual loop detection changes to single loop detection