Fire Detection/Ext - Question Bank Flashcards
What unlocks an engine fire switch?
- Fire warning
- Fuel control switch is in CUTOFF
- Pushing the Fire Override switch beneath the fire switch
How many engine fire extinguishers are provided?
2 on each wing
What occurs when an engine fire switch is pulled out?
- Arms both related engine fire extinguishers
- Closes the related engine and spar valves
- Trips off the related engine generator
- Depressurizes the related EDP
- Shuts off hydraulic fluid to the related EDP
- Closes the related engine bleed air valve
How many APU fire bottles are provided?
One
Can you shut down the APU from outside the airplane?
• Yes, by using the APU Ground Control Fire Protection Panel, located in
the right body gear well.
• There is an APU stop switch, an APU Fire Control Switch and an APU
Extinguisher Discharge Switch, located on the panel.
What action discharges the fire extinguisher, for an engine/or APU?
• Rotating the engine fire switch or the APU fire switch.
• For the APU, the APU extinguisher automatically discharges for an APU
fire warning light when on the ground.
Describe the fire protection system for the forward and aft lower cargo compartments.
• 4 fire extinguisher bottles are provided.
• Pushing the cargo fire discharge switch, with FWD or AFT armed,
initiates extinguisher discharge sequence to provide effective agent
concentration for 210 minutes.
State the actions that occur when you push a FWD or AFT cargo fire arm switch.
• Arms lower cargo compartment fire extinguishers
• Turns off two packs
• Configures equipment cooling to override mode
-Turns off all airflow and heat into lower cargo compartments.
• Closes master trim air valve.
What type of compartment is the main deck cargo compartment?
Class E
What happens when you push the CARGO FIRE Depressurization Switch
with the MAIN deck fire switch ARMED?
Initiates a controlled cabin depressurization.
What happens when you push the main deck Cargo Fire Arm switch?
• Enables main deck fire suppression
• Turns off two packs
• Configures equipment cooling to closed loop and turns off all airflow to
main deck and airflow and heat into lower compartments.
• Closes master trim air valve
Describe the engine fire/overheat detection system.
• A dual loop fire detector is installed in each engine nacelle.
• Each engine has a dual loop overheat detector.
• Both loops in a detector must detect a fire or overheat to cause an
engine fire warning or overheat caution unless configured for single loop
operations.
Describe the APU Fire/Overheat detection system.
• A dual loop fire detector is installed in the APU compartment.
• There is no overheat detection in the APU compartment.
• Either loop detecting a fire activates an APU fire warning, which shuts
down the APU.
• Either loop detecting a fire on the ground discharges the APU fire
extinguisher bottle (certain aircraft).
Describe the Cargo Compartment Fire Detection systems.
• The forward and aft lower compartments have 4 dual loop detectors.
• The main deck has 16 dual loop detectors.
• Sample air from throughout each compartment is drawn through the
detectors by center bleed duct air. Both loops in a detector must sense
smoke to activate the cargo fire warning.
What happens if a fault occurs in one loop upon completion of any fire and overheat
fault test?
• The system reconfigures for single loop operation.
• If the operable loop senses a fire or overheat condition, the related fire
warning or overheat caution activates.
