Fire Protection Flashcards
What airplane systems have Fire Detection and Protection?
- Engines
- APU
- Cargo Compartments
- Lavatories
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
Describe the Fire Test?
- When the TEST button on the fire protection panel is pressed, it initiates
the following: - AURAL
- The fire aural warning(s) sound.
- LIGHTS
- The master WARNING lights flash.
- The fire extinguisher handles illuminate steady.
- The APU fire-extinguishing button and the upper half of the APU
emergency stop button to illuminate. - EICAS MESSAGES
- ENG 1 FIRE
- ENG 2 FIRE
- APU FIRE
- CRG AFT SMOKE
- CRG FWD SMOKE
- EICAS INDICATIONS
- The FIRE warning light on the ITT indicators illuminate.
- SYSTEM CONFIGURATIONS
- The forward cargo compartment fan turns off
- The cargo compartment ventilation outflow valve closes
- (Only when bleed air is being provided by the engines or the APU).
What happens when an engine fire handle is pulled?
- Closes respective engine fuel SOV.
- Closes respective engine hydraulic SOV.
- Closes respective engine bleed SOV.
- Closes the Crossbleed Valve
What is an indication of an APU fire?
- Fire Aural Warning(s)
- Red stripe in the EMER STOP button.
- APU FIRE is displayed on the EICAS
When will the APU automatically shut down if a fire is detected?
- On the ground (after 10 seconds)
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?
- FWD Cargo Recirculation Fan shuts off
- FWD Cargo Ventilation Outflow Valve closes
How many fire extinguishing bottles are installed for the cargo compartments?
- 2 bottles (may only be used in one compartment)
- 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 halon remain active in the compartment if both the high and low rate bottles are discharged?
75 minutes with a 60 minute diversion time allowed.
Can one bottle be used for one compartment and the other bottle for the other
compartment? (Cargo)
No
During flight, can the low-rate bottle be discharged before the minute is up?
- YES, by pushing the extinguishing button again.
How are the Lavs protected from fire?
- Thermal plugs that melt at a set temperature allowing release of the Halon
bottle(s)
Describe the Engine and APU fire detection and protection?
- Engine: 4 Heat Sensing Loops (2 per engine)
- APU: 2 Heat Sensing Loops
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 (in flight)
- If airplane is on the ground (weight-on-wheels) the low-rate bottle will not
automatically discharge
How can the low-rate bottle be discharged if the airplane is on the ground
(weight-on-wheels)?
- The extinguishing button must be pressed again
Can cargo extinguishing be used if no smoke is detected?
- Yes. The high-rate bottle extinguishing button must be pressed twice,
once to arm the bottle and once to discharge the bottle. - The low-rate bottle automatically discharges after one minute (in flight)
