Fire Detection/Prevention Flashcards
What airplane systems have fire detection and protection?
Engines, APU, Cargo Compartments, Lavatories, Recirc Bay (SMOKE DETECTION ONLY)
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)
▪ NOTE: LL Aircraft have 1 FWD and 2 AFT Halon extinguishers and 1 AFT water extinguisher
How are the engines and APU protected from fire?
Engines have 2 Halon fire bottles; APU has 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 BUS; Engine Protection: HOT BATT BUS; APU Detection: DC ESS BUS; APU Protection: DC ESS BUS.
Describe the engine and APU fire detection system.
Engine has 8 pneumatic fire detectors (2 loops) per engine; APU has 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)
Aural warnings include fire bell and triple chime; Visual indications include overhead panel, fire handles, cargo smoke buttons, APU extinguisher button, master warning lights, and EICAS messages.
What happens when an engine fire handle is pulled?
Closes respective engine fuel SOV, hydraulic SOV, and bleed SOVs.
What is an indication of an APU fire?
Fire bell, master warning lights illuminate, red stripe in the EMER STOP button, APU FIRE 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 (bottle armed).
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 (bottle armed).
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, FWD Cargo smoke button is illuminated.
What is the purpose of the actions taken when smoke is detected in the forward cargo compartment?
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 either cargo compartment. Not both simultaneously; 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?
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 to arm and 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.
If an incorrect cargo compartment is armed, how can the panel be reset?
Wait 2 minutes; press the test button.
