Which aircraft areas have fire detection systems?
Engines, APU, Cargo Compartments, Main Gear Wheel Wells and Lavatories
Which areas also have overheat detection systems?
The engines
In flight what conditions will unlock an Engine Fire Switch?
Fire Warning (automatic), Push Engine Fire Override Switch (manual) and Fuel Control Switch to CUT OFF
What systems are affected if a fire switch is pulled?
- Arms both fire extinguishers
- Closes the associated engine and spar fuel valves
- Closes the associated engine bleed are valves
- Trips the associated engine generators off
- Shuts off hydraulic fluid to the associated engine driven hydraulic pump
- Depressurises the associated engine driven hydraulic pump
- Removes power to the thrust reverser isolation valve
What action is required to discharge an engine fire bottle following a fire?
Pull engine fire switch, then rotate to the required extinguisher system, hold for 1 second
How many fire detection loops does each engine have?
Two
Are separate overheat detection loops fitted?
No, the same loop provides both fire and overheat detection
How many detectors must sense a fire or overheat to produce an alert?
Two
If a fault is detected in one loop, will a fire or overheat still be detected?
Yes, the system automatically reconfigures to a single loop detection system
What does an EICAS message DET FIRE ENG (L or R) indicate?
Fire detection system failure in both detector loops
What are the indications of a left engine fire?
- Fire Bell
- Master warning lights illuminate
- EICAS message FIRE ENG L displayed
- Left engine Fire Switch light illuminates
- Left engine Fire Switch unlocks
- Left engine Fuel Control Switch light illuminates
What are the indications of a left engine overheat?
Beeper, Master Caution lights illuminate, EICAS message OVERHEAT ENG L
How many engine fire extinguisher bottles are there?
There are a total of two engine fire extinguishers, both of which may be directed to either engine
What indications are given if the engine fire bottle is discharged or has low pressure?
ENG BTL (1 or 2) DISCH light illuminates & EICAS message: BOTTLE (1 or 2) DISCH ENG
Where is the flight deck APU fire panel located?
On the overhead panel
Where is the APU ground control panel located?
Nosewheel well (On the back of the nosewheel strut)
Which systems are affected when the APU fire switch is pulled?
- Arms the APU fire extinguisher bottle
- Closes the APU fuel valve
- Closes the APU bleed air valves
- Closes the APU inlet door
- Trips the APU generator field and generator breaker
- Shuts down the APU (if automatic shutdown does not occur)
Will the APU shut down automatically for a fire?
Yes
Will the fire bottle discharge automatically?
Only with the aircraft on the ground, and both engines shut down
How many fire extinguisher bottles does the APU have?
One
What are the indications of a wheel well fire?
Fire bell, EICAS message FIRE WHEEL WELL & Master Warning Lights
What does the system consist of?
Dual fire detector loops
What systems are affected when a CARGO FIRE ARM switch is selected to ARM?
- Arms all fire extinguisher bottles
- Arms the selected compartment extinguisher valve
- Turns off both lower recirculation fans
- Shuts down cargo heat
- Commands the packs to provide the minimum air flow required to provide pressurisation
- Shuts down the bulk cargo compartment ventilation system operation (aft cargo fire only)
- Puts the equipment cooling system into the override mode (fwd cargo fire only)
What are the indications of a cargo fire?
- Fire bell
- Master Warning
- EICAS message FIRE CARGO (FWD or AFT)
- CARGO FIRE (FWD or AFT) FIRE warning light illuminates
