Fire Detection / Protection Questions

Question 1

What airplane systems have fire detection and protection?

Answer 1

• Engines
• APU
• Cargo compartments
• Lavatories

Question 2

Are the cockpit and cabin protected from fire?

Answer 2

• Yes
• Cockpit 1 hand-held Halon fire extinguisher
• Cabin 3 hand-held Halon fire extinguishers (1 fwd & 2 aft) one water extinguisher (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 the 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

• Engine detection DC ESS
• Engine protection HOT BATT
• APU detection DC ESS
• APU protection DC ESS

Question 6

Describe the engine and APU fire system?

Answer 6

• Engine 8 pneumatic fire detections (2 loops) per eng

- APU 2 pneumatic fire detectors (2 loops)

Question 7

Describe the fire test?

Answer 7

• 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

Question 8

Aural warning

Answer 8

• Fire bell

- Triple chime

Question 9

Visual Indications

Answer 9

• Overhead panel
  
  • 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
  
  • Master warning light (left)
  • Master warning light (right)
• EICAS
  
  • 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 10

What happens when an engine fire handle is pulled?

Answer 10

• Closes respective engine fuel SOV
• Closed respective engine hydraulic SOV
• Closed respective engine bleed SOV

Question 11

What is an indication of an APU fire?

Answer 11

• Fire bell
• Red strip in the EMER STOP button
• APU FIRE is displayed on the EICAS

Question 12

Will the APU automatically shut down if a fire is detected?

Answer 12

• Yes, Only on the ground

Question 13

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

Answer 13

• APU shits off immediately without a 1 minute cool-down
• APU fuel SOV closes
• APU FIRE EXTG button illuminates

Question 14

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

Answer 14

• After one minute the APU FIRE button illuminates

Question 15

Will the APU fire extinguisher automatically discharge?

Answer 15

• No

Question 16

How many smoke detectors are installed in the cargo compartment?

Answer 16

• 3 detectors in the FWD compartment

- 2 detectors in the AFT compartment

Question 17

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

Answer 17

• Recirculation fan shut off

- Ventilation outflow valve close

Question 18

What is the purpose of this (refer to above question)?

Answer 18

• Prevents oxygen from entering the compartment

- Prevents Halon agent from escaping into the aircraft cabin

Question 19

How many extinguisher bottles are installed for the cargo compartments?

Answer 19

• 2 bottles used for both compartments

- 1 high-rate bottles and 1 low-rate bottle

Question 20

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

Answer 20

• High rate bottle saturates the compartment immediately

- Low rate bottle maintains saturation over a duration of time

Question 21

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

Answer 21

• 60 minutes

Question 22

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

Answer 22

• No, only one compartment maybe selected (FWD or AFT)

Question 23

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

Answer 23

• 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 24

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

Answer 24

Yes, by pushing the extinguishing button again

Question 25

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

Answer 25

- The extinguishing button must be pushed again

Question 26

Can cargo extinguishing be used if no smoke is detected?

Answer 26

- 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 one minute if in flight

Question 27

How are the lav's protected from fire?

Answer 27

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