15.20 Flashcards
(15 cards)
How are fire zones designated
By the manufacture
Who descends what types of fire detector is used in a fire zone
Manufacture
What are the two types of turbine failure
Mechanical
Thermodynamic
What causes thermodynamic turbine failure
Upset to the proportion of air used to cool down turbine
Ice buildup on turbine screens
Faulty controls like excessive fuel or excessive bleed air leak
What is mechanical turbine failure
High fuel flow as of broken fuel nozzles
Fracture or thrown blades
Breakage
How are fires detected
Over heat detectors
Rate of temp rise detectors
Flame detectors
What are the two most common fire detectors
Spot detectors -discrete
Continuous loop detectors- over large area
How does a thermal switch detect fires
Uses thermal switches and has a set temp range at which a signal is sent
How are switches and lights connected in a thermal switch system
Switches are connected in parallel
Indicator light connected in sires
What is the disadvantage of a thermo couple system
Depends on the rate of temperature rise (needs quick rise) so a slowly developing fire may not be detected
What happens if both junctions of a thermo couple are heated at the same rate
There will be no indication
What are the two types of optical fire detectors
Infrared
UV
What are optical fire detectors also known as
Flame detectors
Where is an infrared fire detector used
On light turboprop aircraft and helicopter engines
What is the structure of a pneumatic thermal fire detector
Helium filed tube connected at one end to a responder assembly
