Fire Detection/Protection Questions Flashcards
What airplane systems have fire detection and protection?
- Engines
- APU
- Cargo Compartments
- Lavatories
Are the cockpit and cabin protected from fire?
- Yes
- Cockpit 1 hand-held Halon fire extinguisher
- Cabin 3 hand-held Halon Fire extinguishers (1 fwd. & 2 aft); one water extinguisher (aft, aircraft right)
How are the engines and APU protected from fire?
- Engines 2 Halon fire bottles
- APU 1 Halon fire bottle dedicated to the APU only
Can both engine fire bottles be used for one engine if needed?
- Yes
What is the power source for engine and APU fire detection and protection?
- Engine Detection DC ESS
- Engine Protection HOT BATT
- APU Detection DC ESS
- APU Protection DC ESS
Describe the engine and APU fire detection system
- Engine 8 pneumatic fire detectors (2 loops) per engine
- APU 2 pneumatic fire detectors (2 loops)
Describe the fire test
- 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
Fire bell
Triple chime - Visual indications
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)
What happens when an engine fire handle is pulled?
- Closes respective engine fuel SOV
- Closes respective engine hydraulic SOV
- Closes respective engine bleed SOV
What is an indication of an APU fire?
- Fire bell
- Red stripe in the EMER STOP button
- APU FIRE is displayed on the EICAS
Will the APU automatically shut down if a fire is detected?
- Only on the ground
What happens if the APU EMER STOP button is pushed after a fire has been detected?
- APU shuts off immediately without a 1-minute cool-down
- APU fuel SOV closes
- APU FIRE EXTG button illuminates
What happens if the APU EMER STOP button is not pushed after a fire has been detected?
- After one minute the APU FIRE EXTG button illuminates
Will the APU fire extinguisher automatically discharge?
- No
How many smoke detectors are installed in the cargo compartments?
- 3 detectors in the FWD compartment
- 2 detectors in the AFT compartment
What happens to the forward cargo compartment in the event smoke is detected?
- Recirculation fan shuts off
- Ventilation outflow valve closes
What is the purpose of the recirculation fan shutting off and the ventilation outflow valve closing when smoke is detected in the cargo bays?
- Prevents oxygen from entering the compartment
- Prevents Halon agent from escaping into the aircraft’s cabin
How many extinguishing bottles are installed for the cargo compartments?
- 2 bottles used for both compartments
- 1 high-rate bottle and 1 low-rate bottle
What is the difference between the high-rate bottle and the low-rate bottle?
- High-rate bottle saturates the compartment immediately
- Low-rate bottle maintains saturation over a duration of time
How long will the low-rate bottle remain active in the compartment?
- 60 minutes
Can one bottle be used for one compartment and the other bottle for the other compartment?
- No. Only one compartment may be selected (FWD or AFT)
What happens when a cargo extinguishing button is pushed if smoke has been detected?
- 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
During flight, can the low-rate bottle be discharged before the minute is up?
- Yes, by pushing the extinguishing button again
How can the low-rate bottle be discharged if the airplane is on the ground (weight-on-wheels)?
- The extinguishing button must be pushed again
Can cargo extinguishing be used if no smoke is detected?
- 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
How are the lavs protected from fire?
- Heat-sensitive extinguishers in the lav waste bins automatically discharge if a predetermined temperature is reached
