Fire Protection Flashcards
The detection system of the fire protection system detects fire possibility where?
- Engines
- APU
- Main Landing Gear Bays
The extinguishing system of the fire protection system extinguishes fire possibility where?
- Engines
- APU
Both the engine and the APU have how many detection loops?
Two. Both must sense an overheat condition in a preset time to generate a fire indication.
The control unit for the fire protection system is what?
FIREX-CU. Electronic fire detection and extinguishing control unit monitors the electrical resistance of the loops.
The FIRE-CU control unit is located where?
Aft equipment bay
If one loop fails in a dual loop system, what happens?
The second loop is still capable of detecting a fire.
If a fire is detected in the engine, what six things happen?
- Affected L/R ENG FIRE switch illuminates
- Master warning light illuminates
- Master warning chimes
- Affected L/R ENGINE FIRE message appears on EICAS
- Red FIRE EI appears in the N1 indicator
- Aural “Left” or “Right Engine Fire” sounds
An APU fire can only be extinguished from what bottle?
Bottle 2
When an overheat condition is detected in the APU area on the ground, what occurs?
The APU shuts down automatically. Five seconds later, bottle 2 automatically discharges Halon into the APU enclosure.
When an overheat condition is detected in the APU area in flight, what occurs or must happen?
The APU FIRE switch is pushed to shut down the APU and arm the discharge cartridge on bottle 2. The crew discharges the bottle 2 by pushing FIRE EXT 2 switch.
If a fire is detected in the APU enclosure, what five things occur?
- APU FIRE switch illuminates
- Master warning light illuminates
- Master warning chimes
- APU FIRE red warning message appears on EICAS
- Aural “APU FIRE” sounds
Why do the wheel wells require an overheat detection system?
Because the wheel wells are made of composite materials
The main landing gear bays are protected by how many detection loops?
One
What three things happen when an overheat is detected in a main landing gear bay?
- Master warning lights illuminate
- A triple chime sounds
- A GEAR BAY OVHT red warning CAS message illuminates
Should a fire occur in the cargo bay, how is the crew notified?
- Master warning lights illuminate
- Master warning chime sounds
- CARGO SMOKE red warning illuminates on EICAS
What detects a fire or the presence of smoke in the cargo area?
Single smoke detector mounted in the ceiling
How is a fire extinguished in the cargo area?
Must be extinguished with a portable fire extinguisher
The FIREX bottles are filled with what?
Halon 1301
What occurs when a L or R ENG FIRE switch is depressed? (7)
- Applicable squib on both bottles is armed
- Both EXT 1 and 2 switches illuminate ARMED
- Fuel shutoff valve closes
- Hydraulic shutoff valve closes
- Generator selected offline
- Bleed air shutoff valve closes
- FADEC commands an engine shutdown
What occurs when the APU FIRE switch is depressed? (6)
- APU squib on bottle 2 is armed
- EXT 2 switch illuminates ARMED
- APU fuel shutoff valve closes
- APU bleed-air shutoff valve closes
- APU generator selected offline
- APU ECU closes the APU fuel metering valve
