11.8 fire protection Flashcards
(60 cards)
for a fire to occur what 3 things are required
fuel, heat, oxygen
what is a fire zone
area of aircraft that requires detection or extinguishing systems
what are some of the fire detection methods used on aircraft
overheat detector, rate of temp rise detector, flame detector, crew observation
where are overheat warnings used
areas of high temperature
what are the 3 most common fire detectors
thermal switches, thermocouples, continuous loop sensing
when the heat rises what does a thermal switch do
thermal switch closes
how does a thermocouple work
measures rate of temperature change
what is a thermocouple constructed out of
two dis-similar metals
what fire detection method do most modern aircraft have
continuous loop
what are the 2 widely used continuous loop detectors
thermistor, pneumatic pressure
what is the tube made of in a fenwal system
inconel
what are the 2 continuous loop systems
fenwal, kidde
does a kidde system have 2 or 1 conductor running through it
2
does a fenwal system have 1 or 2 conductors running through it
1
what principle does the pneumatic continuous loop work on
gasses that expand under heat
what are the 2 pneumatic continuous loop sensing functions
overall overage temp, localised temp increase
are the 2 pneumatic sensing functions factory or changeable
factory
what are the 2 basic smoke detection systems
photoelectric, ionisation
what are the 2 subsystems of photoelectric smoke detection systems
comparison, refraction
briefly describe the photoelectric smoke detector
light reflects and when the reflecting isn’t read on the opposite sensor it alerts the flight deck
when are lavatory smoke detectors required
20 or more passengers
what is the lavatory smoke detector powered with
28 V DC
what colour does the lavatory smoke detector go when it detects smoke and when does it go out
red and goes out when no smoke is present
what designated zones have fixed fire detection/extinguishing
engines, APU, cargo, lavatories
