Fire Detection/Protection

Question 0

Are the cockpit and cabin protected from fire?

Answer 0

Yes.
Cockpit-1 handheld Halon fire extinguisher.
Cabin- 4 handheld Halon fire extinguishers (2 FWD & 2 AFT)

Question 1

What airplane systems have fire detection and protection?

Answer 1

Engines
APU
Cargo Compartments
Lavatories

Question 2

How are the engines and APU protected from fire?

Answer 2

Engines-2 Halon fire bottles

APU-1 Halon fire bottle dedicated to the APU only

Question 3

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

Answer 3

Yes

Question 4

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

Answer 4

Engine Detection DC ESS
Engine Protection HOT BATT
APU Detection DC ESS
APU Protection DC ESS

Question 5

Describe the engine and APU fire detection system.

Answer 5

Engine-8 pneumatic fire detectors (2 loops) per engine

APU - 2 pneumatic fire detectors (2 loops)

Question 6

Describe the fire test

Answer 6

1. Press and hold the test button on the overhead panel for a minimum of 3 seconds, but no more than 10 seconds. If the APU is running or it will automatically shut down the APU.
2. Aural warnings(2) -fire bell, triple chime.
3. Visual indications(15 total)
   Overhead panel(6)-
   fire handle one, fire handle two, cargo smoke (FWD) extinguisher button, cargo smoke (AFT) extinguisher button, APU extinguisher button, APU EMER STOP (top half of button)
   Glareshield(2)-
   master warning light (left), master warning light (right)
   EICAS(7)-
   ENG 1 FIRE (CAS message), ENG 2 FIRE (CAS message), CARGO FWD SMOKE (CAS message), CARGO AFT SMOKE (CAS message), APU FIRE (CAS message), FIRE (engine 1 ITT gauge), FIRE (engine 2 ITT gauge),

Question 7

What happens when an engine fire handles pulled?

Answer 7

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

Question 8

What is an indication of an APU fire?

Answer 8

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

Question 9

Will the APU automatically shut down if the 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 without a 1-minute cooldown
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 1 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 smoke detectors in the FWD compartment

2 detectors in the AFT compartment

Question 14

What happens in the forward cargo compartment in the event smoke is detected? What is the purpose of this?

Answer 14

Recirculation fan shuts off
Ventilation outflow valve closes

Prevents oxygen from entering the compartment
Prevents Halon agent from escaping into the aircraft’s cabin

Question 15

How many extinguishing bottles are installed in the cargo compartments?

Answer 15

2 bottles used for both compartments

1 high-rate bottle and one 1 low-rate bottle

Question 16

How long will the low-rate bottle remain active in the compartment?

Answer 16

60 minutes

Question 17

Can one bottle be used for one compartment in the other bottle for the other compartment?

Answer 17

No. Only one compartment may be selected (FWD or AFT)

Question 18

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

Answer 18

Hi-rate bottle discharges immediately
Low-rate bottle discharges after 1 minute if the airplane is in flight
If airplane is on the ground (weight-on-wheels) the low-raid bottle will not automatically discharge

Question 19

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

Answer 19

Yes by pushing the extinguishing button again

Question 20

How can the low-rate bottle be discharged if the airplane is on the ground (weight-on-wheels)?

Answer 20

The extinguishing button must be pushed again

Question 21

Can the cargo extinguishing be used if no smoke is detected?

Answer 21

Yes. The high-rate bottle extinguishing button must be pushed twice, once to arm the bottle and wants to discharge the bottle.
Low-rate bottle automatically discharges after 1 minute, if in flight

Question 22

Are the lavs protected from fire?

Answer 22

Heat-sensitive extinguishers in the lav waste bins automatically discharge if a predetermined the temperature is reached.