Fire Detection/ Protection Questions

Question 1

Are the cockpit and cabin protected from fire?

Answer 1

Yes
Cockpit 1 hand-held halon fire extinguisher
Cabin 3 hand-held halon fire extinguisher (1 fwd. & 2 aft); one water extinguisher (aft)

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 ones engine if needed?

Answer 3

Yes

Question 4

What is 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 detection system (2 loops) per engine
APU: 2 pneumatic fire detectors (2 loops)

Question 6

Describe the fire test

Answer 6

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

Aural warnings (2)
•Fire Bell
•Triple Chime

Visual indication
• Overhead panel (6 lights)
   Fire handle 1
   Fire handle 2
   Cargo smoke (FWD) extinguisher button
   Cargo smoke (AFT) extinguisher button
   APU extinguisher button
   APU EMER STOP ( top half of button)

•Glare shield (2 lights)
Master warning light (left)
Master warning light (right)

•EICAS (7 messages)
   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 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 in the EMER STOP button
APU FIRE is displayed on the EICAS

Question 9

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 without a 1-minute cool-down

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

Recirculation fan shuts off

Ventilation outflow valve closes

Question 15

What is the purpose of the recirc fan off and ventilation outflow valve closing?

Answer 15

Prevents oxygen from entering the compartment

Prevents halon agent from escaping into the aircraft’s cabin

Question 16

What airplane systems have fire detection and protection?

Answer 16

Engines
APU
Cargo Compartments
Lavatories

Question 17

How many extinguishing bottles are installed for the cargo compartments?

Answer 17

2 bottles used for both compartments

1 high-rate bottle and 1 low-rate bottle

Question 18

What is the difference between the high-rate bottle and the low-rate bottle?

Answer 18

High rate bottle saturated the compartment immediately

Low rate bottle maintains saturation over a duration of time

Question 19

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

Answer 19

60 min

Question 20

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

Answer 20

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

Question 21

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

Answer 21

High rate bottle discharges immediately
Low-rate bottle discharges after one minute if the airplane is in flight
If airplane is on the ground (weight-on-wheels) the low rate bottle will NOT automatically discharge

Question 22

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

Answer 22

Yes, by pushing the extinguishing button again

Question 23

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

Answer 23

The extinguishing button must be pushed again

Question 24

Can cargo extinguishing be used if smoke is detected?

Answer 24

Yes. The high-rate bottle extinguishing button must be pushed twice, once to arm the bottle and once to discharge the bottle

The low-rate bottle automatically discharges after the one minute if in flight

Question 25

How are the lavs protected from fire?

Answer 25

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