15.20 fire protection system Flashcards
(15 cards)
what are the two major types of turbine failure
thermodynamic
mechanical
what is thermodynamic turbine failure
causes an upset to the proportion of air used to cool down combustion temps to the levels that the turbine materials can tolerate
when cooling cycle is upset what happens
turbine blades can melt - causing a sudden loss of thrust
what happens if there is a rapid build up of ice on inlet screens
severe over heating
can cause turbine blades to melt
what are mechanincal failures
fractured or thrown blades
how is fractured blades a fire hazard
they can puncture lines containing flammable fluids
what type of aircraft use thermal switch systems
older aircraft
what concept does thermocouple system work on
based on the rate of temperature rise
what are optical sensors sometimes called
flame detectors
what aircraft use ir based flame detector
light turboprop and helicopter
what extinguishing agent is most used
halon 1301
what does red disc thermal indicator means
fire extinguisher has been dumped overboard due to excessive heat
what does yellow disc discharge indicator mean
means that the fire extinguish system was activated by the flight crew
when fire switch is activated what happens
the engine stops due to fuel control valve closed
fire extingush system is armed
