Fire & Smoke Flashcards
Which areas of the aircraft have smoke detection?
Cargo compartments
Lavatories
Avionics bay
Which areas of the aircraft have fire extinguishing?
Cargo compartments
Engines
APU
Lavatories
How many fire detection loops are there in the engines? What about the APU?
Two identical loops (A and B) mounted in both engines and in the APU
How many fire extinguishing bottles are there in the engines and in the APU?
Two in each engine
One in the APU
When does a fire warning appear in the flight deck?
- If both A and B loops send a fire signal
- One loops sends a fire signal and the other is failed
- Breaks in both loops occur within 5s of each other (flame effect)
- A test is performed on the FIRE panel
When does a fire loop-fault caution appear in the flight deck?
One loop is failed, or
Both loops have failed, or
The Fire Detection Unit (FDU) fails
What is an FDU?
Fire Detection Unit
It makes up part of the fire and overheat detection system, along with loops A and B
Describe what happens if an APU fire is detected on the ground
The APU initiates an automatic shutdown sequence
The extinguisher bottle discharges automatically (3 sec after the appearance of the fire warning)
How long does smoke have to be detected for before a single chime and a MASTER CAUTION on the flight deck?
More than 5 seconds
Where is the smoke detector fitted in the lavatories?
In the air extraction duct of the lavatory
What happens if there is a fire in the lavatory waste bin?
Each lavatory wastebin has an automatic fire extinguishing system
When does smoke in a cargo compartment activate the cargo smoke warning?
If both smoke detectors detect smoke
OR
If one smoke detectors detects smoke and the other is inoperative
How many fire bottles are used for the cargo compartment fire extinguishing system?
One
Two dishcharge heads, one for FWD cargo compartment and one for AFT cargo compartment
Will the CARGO SMOKE push buttons extinguish when a fire is no longer detected?
No (the DISCH light comes on in amber when the bottle is empty)
Where do the fire loops run through the engines?
Nacelle
Fan
Core
Pylon
