Fire Detection/Protection Questions

Question 1

What airplane systems have fire detection and protection?

Answer 1

Engines
APU
Cargo compartments
Lavs

Question 2

Are the cockpit and cabin protected from fire?

Answer 2

Yes, cockpit has 1 handheld halon, cabin has three halon and one water. (1 fwd, 2 aft)

Question 3

How are the engines and APU protected from fire?

Answer 3

Engines: 2 halon fire bottles
APU: 1 halon fire bottle dedicated to APU only

Question 4

Can both engine fire bottles be used for one engine if needed?

Answer 4

Yes

Question 5

What is the power source for engine and APU fire detection and protection?

Answer 5

APU detection and protection - DC ESS
Engine protection - HOT BATT
Engine detection - DC ESS

Question 6

Describe the engine and APU fire detection and protection system

Answer 6

Engine: 8 pneumatic fire detectors (2 loops) per engine
APU: 2 pneumatic fire detectors (2 loops)

Question 7

What happens when an engine fire handle is pulled?

Answer 7

Closes respective engine fuel SOV
Closes respective engine hydraulic SOV
Closes respective engine bleed SOV

Question 8

What is an indication of an APU fire?

Answer 8

Fire bell
Red stripe on APU EMER STOP button
APU FIRE is displayed on the EICAS

Question 9

When will the APU automatically shut down if a fire is detected?

Answer 9

Only on the ground

Question 10

What happens if the APU EMER STOP button is pushed after a fire has been detected?

Answer 10

APU shuts off immediately
APU fuel SOV closes
APU FIRE EXTG button illuminates

Question 11

What happens if the APU EMER STOP button is not pushed after a fire has been detected?

Answer 11

After one minute the APU FIRE EXTG button illuminates

Question 12

Will the APU fire extinguisher automatically discharge?

Answer 12

No

Question 13

How many smoke detectors are installed in the cargo compartments?

Answer 13

3 detectors in the FWD compartment

2 detectors in the AFT compartment

Question 14

What happens to the forward cargo compartment in the event smoke is detected?

Answer 14

Recirc fan shuts off
Outflow valve closes
(preventing smoke and halon in cabin)

Question 15

How many extinguishing bottles are installed for the cargo compartments?

Answer 15

2 bottles used for both compartments

1 high rate bottle and one low rate bottle

Question 16

How long will the low rate bottle remain active?

Answer 16

60 minutes

Question 17

What happens when a cargo extinguishing button is pushed if smoke has been detected?

Answer 17

High rate bottle discharges immediately
Low rate bottle discharges after one minute if airplane is in flight
Must press again for discharge of low rate bottle on ground

Question 18

During flight, can the low rate bottle be discharged before one minute is up?

Answer 18

Yes, by pressing the button again

Question 19

Can cargo extinguishing be used if no smoke is detected?

Answer 19

Yes, the button must be pressed twice - once to arm and once to discharge. The low rate bottle will automatically discharge after one minute in flight