Fire Protection Flashcards
Systems that make up fire protection
Detection and extinguishing
Parts of fire protection system
Sensor , control unit , panel
Where is the sensor
Monitored area
Where is the control unit
Avionic deployment
Where is the panel located
Cockpit
Continuous loop detection system types
Semi conductor and pneumatic pressure
Types of smoke detector systems
Optical and ionisation
What happens in a semi-conductor as temperature increases
There is a decrease in electrical resistance
Semi conductor manufacturers
Kidde , graviner , Edison , Fenwal
Pressure loop manufacturer
Systron and doner
How does pressure loop work
As temp increases the gas pressure operates a switch
Where is the smoke detector used
Cargo department, toilets , avionic department
What smoke detector uses a radiation source
Ionisation type
How is fire warning indicated
Red attention getters and messages on ECAM or EICAS
When is fire detection indicated on a duel loop system
When sensors detect at the same time
Addition features of apu detection
Automatic shut down , red flashing light , horn in wheel well
Areas covered by detection system
Engines , apu wheel wells , cargo areas
What type of sensor is a spot sensor
Bi-metallic switch
How do discharge heads relate to cargo
Heads connected to bays by pipes to distribute extinguisher fluid via flow limiters
Cargo class A
No fire detection or extinguishing
Class B cargo
Fire detection because ventilated but no extinguishing
Class C cargo
Detection and extinguishing as ventilated and not accessible
Class D cargo
Same as class C after 2003
Class E cargo
Detection needed only
How many smoke detectors in avionics bay
1 installed on cooling duct outlet
What is semi conductor loop made of
Stainless steel tube
How many internal wires does kidde have
2
How many Fenwal , graviner & Edison internal wires
1
How does resistor work in semi conductor
Negative temperature coefficient
When does fire get detected
Resistance decrees below 500 ohms
Max bend in loop insulation
3.2mm
Minimum bend radius
25.4mm or 1 inch
How does optical detector work
Smoke in air cause light refraction
Photo resistor lit up and decreases resistance which sets off alarm
How does ionisation smoke detector work
Analyses composition of air
Clean air molecules are lighter then smoke
What should you never do in regard to ionisation smoke detector
Open it as can expose to radiation
What do you check on portable extinguishers
Visual date check of usage and gauge
What extinguishers are used on on portable extinguishers
Halon 1211
What extinguishers are used on installed extinguishers
1301
When is a installed extinguisher checked
C check every 20-24 months
Pressure of installed extinguisher
600 psi
How does discharge of an engine extinguisher occur
Squib caused explosive to break frangible disc
