11.8 Fire Protection * Flashcards
What is fitted in large areas and where the fire source is not known?
Smoke detectors
What is used in engines, APU, wheel well and hot air ducts for overheat detection?
Temperature sensitive detectors
What type of switch is the spot sensor?
Bi-metallic type switch
What are the 2 types of continuous loops for fire detection?
- Semi conductor loop
- Pneumatic pressure loop
What type of sensor is always on the engine fire detection system?
Dual continuous loop
What types of continuous loops are found on engines?
Both
What is the local warning of a fire detection system?
Red light inside a switch
What type of system do all essential fire warning systems use?
Dual loop systems
When is a fire warning triggered in a dual loop system?
If both sensors detect fire at same time
What is the ground warning in the APU fire detection system?
- if cockpit empty
- in nose or main wheel well area
- red light flashes and warning horn sounds
What are the 2 types of sensors in the pneumatic duct leak detection system?
- Spot sensor
- Semiconductor continuous loop
What is a disadvantage of the bi-metallic sensor system?
Control unit cannot detect a fault condition of this sensor
Where does the warning for a pneumatic dict leak appear?
Pneumatic or air conditioning panel
⚠️Class A (baggage compartment/wardrobe - accessible )
❌ fire detection system
❌ extinguishing system
⚠️Class B (lower or upper deck cargo compartment - accessible )
✅ fire detection system
❌ extinguishing system
⚠️Class C (lower or upper deck cargo compartment - not accessible)
✅ fire detection system
✅ extinguishing system
⚠️Class D (lower deck cargo compartment - small amount or no ventilation)
(Not required until 2003)
✅ fire detection system
✅ extinguishing system
Class E (cargo compartment in a freighter aircraft)
✅ fire detection system
❌ extinguishing system
How is the central warning cancelled on the ECAM or EICAS display?
Pressing the master warning light
⚠️What are the manufacturers names for semiconductor loops?
Kidde, Graviner, Edison or Fenwal
What are the 2 types of smoke detectors?
- optical system
- ionization type
How do semiconductor loops work?
Decreases electrical resistance with increasing temperature
How do pneumatic pressure loops work?
As gas increases with temperature it operates a pressure switch
⚠️How does the kidde, Fenwal, Graviner or Edison type conductors works?
Have a negative temperature coefficient (NTC)
