Fire Protection Flashcards
How many detectors in the engines must sense a fire or overheat to produce an alert?
Normally, at least one element on each channel.
How many fire detection loops does each engine have?
2 loops per engine.
If a fault is detected in one loop, will a fire or overheat still be detected?
Yes, remaining channel automatically switches to single channel operation. Fire detection is still available.
What does an EICAS message “DET FIRE ENG L/R” indicate?
Both detector channels on one engine has failed. Fire detection system has failed.
What are the indications of a left engine fire?
- Fire bell
- Master warning light
- EICAS “FIRE ENG L”
- Engine fire switch LEFT fire warning light
- Engine fuel control switch LEFT fire warning light
- Engine fire switch LEFT unlocks
What are the indications of a left engine overheat?
- Caution beeper sounds
- Master caution light
- EICAS “OVERHEAT ENG L”
In flight, what conditions will unlock an engine fire switch?
A fire warning or FUEL CONTROL switch in cutoff on the related engine.
How many fire extinguisher bottles does each engine have?
Two bottles in total for both engines.
What indications are given if the engine fire bottle is discharged or has low pressure?
- ENG BTL DISCH light illuminates (1 or 2)
- EICAS “BTL 1/2 DISCH ENG”
Will the APU shut down automatically for a fire on the ground with both engines shut down?
Yes
Is there a difference to the fire protection system on the APU when on the ground with both engines shut down and APU running?
Yes, a signal from a single loop is sufficient to automatically shut down the APU and discharge the bottle.
Where is the APU ground control fire protection panel located?
On the nose gear
Which areas are covered by the wheel well fire protection systems?
Only the main gear well
What does the wheel well fire protection consist of?
Dual channel detectors for overheat and fire in the main gear wheel well.
What are the indications of a cargo fire?
- Fire bell
- Master warning light
- EICAS “FIRE CARGO FWD/AFT”
- CARGO FIRE light (FWD or AFT)
How many cargo compartment fire extinguisher bottles are there?
Total of 6 bottles
How is cargo fire extinguishing initiated?
Automatically upon sensing a fire warning.
Can also be manually initiated by pushing CARGO FIRE DISCHARGE switch.
How many cargo fire extinguisher bottles are fired first and how is this indicated?
Two bottles discharged immediately.
- CARGO FIRE DISCHARGE light illuminates
- EICAS “BOTTLE DISCH CARGO”
When do the remaining cargo fire extinguisher bottles discharge in the air? Is this always the case?
After a 15 minute delay, remaining 4 bottles discharge at a reduced rate. If landing is made within the 15 minutes, one of the remaining bottles discharges on touchdown.
What is the effect when a “CARGO FIRE ARM” switch is selected to ARM?
- Arms all cargo fire extinguisher bottles
- Arms the selected compartment extinguisher valve
- Turns off lower recirculation fans
- Shuts down cargo heat
- Commands the packs to minimum flow
- Shuts down bulk cargo ventilation system (AFT fire only)
- Shuts down the lavatory/galley vent fan (AFT fire only)
- Associated equipment cooling system into override mode
- Turns off miscellaneous equip. cooling fan (FWD fire only)
- Shuts of IFE cooling
- Turns off NGS
- Turns off door 4 galley chiller units (AFT fire)
- Outflow valves move to 50/50 flow split
- Turns off zonal dryer fans
What happens when the engine fire switch is pulled out?
- Closes engine fuel valve and spar fuel valve
- Shuts off hydraulic fluid to the EDP
- Depressurizes the EDP
- Arms both extinguishers
- Closes the engine anti-ice valves
- Trips the generator off
- Removes power to the thrust reverser isolation valve
How many fire detection loops are there for the APU?
Two loops
How long is the delay after APU fire automatic shutdown in flight until the bottle discharges? Why?
15 seconds.
Allows time for the APU fuel valve to shut.
Which cargo compartments, if any, have smoke detection?
All cargo compartments.
