Fire Detection Flashcards
What airplane systems have fire detection and protection?
- engine
- APU
- cargo compartments
- lavs
Are the cockpit and cabin protected from fire?
- yes
- cockpit: 1 handheld halon ext
- cabin: 2handheld halon/1 handheld h2o/glycol in the aft cabin
How are the engines and APU protected from fire?
- engine 2halon bottles
- APU 1 halon bottle dedicated to just the APU
Can both engine fire bottles be used for one engine?
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 three seconds, but no more than 10 seconds if the APU is running or it will automatically shut down the APU
-aural warning
Firebell
Triple chime
-visual indications
-OH panel
Fire handle 1
Fire handle 2
Cargo smoke fwd ext button
Cargo smoke aft ext button
APU ext button
APU EMER STOP (top half of button)
-glareshield
Master warning light (left)
Master warning light (right)
-EICAS
ENG FIRE 1 (cas message)
ENG FIRE 2 (cas message)
CARGO FWD SMOKE (cas message)
CARGO AFT SMOKE (cas message)
APU FIRE (cas message)
What happens when an engine fire handle is pulled?
- closes respective engine fuel sov
- closes eng hydraulic sov
- closes eng 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 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 min cool down
- apu fuel sov closes
- APU FIRE EXTG button illuminates
What happens if the APU EMER STOP button is not pressed after a Fire has been detected?
After one minute the APU FIRE EXT 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
- 2 detectors in the aft
What happens to the fwd cargo compartment when smoke is detected?
- recirculating fans turn off
- ventilation outflow valve closes
what is the purpose of this (refer to last card)?
- prevents oxygen from entering the compartment
- prevents halon agent from escaping into the plane 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 saturates the compartment immediately
- low rate 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 plane is on the ground (WOW) 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 (WOW)?
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
