engine fire protection Flashcards
what are the essential ingredients necessary for any fire to occur
ignition source, oxygen and fuel
what is the purpose of a discharge cartridge and how is it activated
the electrically operated discharge cartridge releases the fire extinguishing agent
how is an HRD fire extinguisher agent distributed
open end tubes
what is an HRD fire extinguisher system
a fire extinguisher system with a high rate of discharge
what is likely to happen when an engine fire sensing loop is excessively kinked or bent
a false warning
what is the proper method for determining the fire extinguisher container pressure
container gauge pressure used with a pressure-temperature curve/chart will indicate if the pressure is within limits
what indicates low agent pressure in a container in a fire extinguisher
a pressure guage
what are the red and yellow disks associated with a fire extinguisher system used to indicate
red indicates a thermal discharge and yellow indicates a normal discharge
what group of fire extinguishing agents are no longer being manufactured because of environmental concerns and are subject to strict handling and disposal regulations
halons ( freon or chlorofluorocarbons )
how long does it take to discharge a HRD system
one to two seconds
what are two methods used to distribute fire extinguishing agent
perforated tubing and or discharge nozzles
what is the purpose of a fire extinguishing system
to dilute the atmosphere around a fire with an inert agent that will not support combustion
what is the principle of operation in a Fenwall continuous loop fire protection system
A single wire is surrounded by ceramic beads in an Inconel. the resistance is lowered with temperature rise
name at least two types of fire detector systems used for engine fire protection
overheat
rate of rise
flame detector
what will happen in a thermocouple fire warning system on an engine that overheats slowly
nothing, because it takes a fast rate of rise or rapid heating to operate
what happens to a thermal switch fire protection when it is heated enough to operate
switch contacts close and provide a ground for the cockpit fire warning devices
what is the principle of operation of a Kidde continuous loops fire protecting system
two wire are imbedded in special ceramic core within an inconel tube. one wire is a ground and the second wire is a hot lead that provides a current when the ceramic core material changes its resistance due to temperature
what is a type of fire detection system that permits more complete coverage of an area thatn spot-type temperature detectors
a continuous loop system
what is the minimum number of thermal switch units needed for a thermal switch fire protection system
at least one
what electrical power is needed for a thermocouple produced voltage
the aircraft electrical system and thermocouple produced voltage
