Systems - Fire Protection

Question 1

Is it necessary to test the fire detection/protection systems during preflight?
Why not?

Answer 1

No because it is self testing every flight

Question 2

What type of fire detection is used in the cargo pits?

Answer 2

Smoke detectors

Question 3

Is a cargo fire a recall item?

Answer 3

No

Question 4

How many fire bottles are in the cargo fire protection system?

Answer 4

5

Question 5

When fighting a cargo fire, in what sequence are these bottles employed?

Answer 5

• 2 bottles are deployed immediately
• 3 start metering after 20 minutes.

If the plane lands prior to the 20 minutes
* one bottle blows on landing.

If the plane is on the ground
* 1 bottle blows after 20 minutes

Question 6

What happens in the equipment cooling system when the forward cargo fire switch is armed?

Answer 6

Goes into override.
* Shuts down all the recirc fans
* turns off cargo heat in forward cargo compartment
* commands pack to supply air into cockpit and supernumerary area
* turns off the nitrogen generation system
* vents the air through the E/E bay to the forward outflow valve

Question 7

After fighting a cargo fire would you expect to see the EICAS warning message go away if the fire is extinguished?

Answer 7

Not right away as the smoke detectors take time to distinguish between smoke and halon

Question 8

What precaution must be taken when using Halon?

Answer 8

Use a PBE

Question 9

What does the APU BTL DISCH light indicate?

Answer 9

Bottle has been discharged and/or the bottle pressure is low

Question 10

How many fire extinguishers for the APU?

Answer 10

1 bottle

Question 11

How many Loops on the APU?

Answer 11

2

Question 12

Can the APU bottle be discharged without an indication of a fire?

Answer 12

Yes as it is on the HOT batt bus

Question 13

Name as many engine fire indications as you can.

Answer 13

• EICAS MSG
• engine fire switch lights
• fuel control switch lights
• aural bell
• master warning on glareshield

Question 14

Name automatic actions when engine fire handle pulled.

Answer 14

• bleed is closed
• engine driven hyd pump is depressurized
• hyd fluid is shutoff
• engine driven electric generator is tripped
• fire bottle squibs arm
• isolates affected engine thrust reverser

Question 15

Name automatic actions when APU fire handle pulled.

Answer 15

• bleed is closed
• electric generator is tripped
• APU inlet door is closed
• in unattended mode discharges the fire bottle

Question 16

How many fire detection loops in engine and APU?

Answer 16

• Engine has 2
• APU has 2

Question 17

How many needed to detect a fire?

Answer 17

Normally 2 except in single loop operation

Question 18

How many engine fire bottles are there?

Answer 18

2

Question 19

How is fire detected in the lavatories?

Answer 19

Lavatory smoke detector and a single trash can fire extinguisher