ENGINE FIRE PROTECTION SYSTEMS

Question 1

what types of fire detector systems are used for engine fire detection

Answer 1

overheat rate of rise and flame detectors

Question 2

how does a thermal switch fire protection system operate

Answer 2

when heated past a predetermined temperature the switch closes causing the warning device in the cockpit to activate

Question 3

how many thermal switches are needed in a thermal switch fire protection system

Answer 3

at least one

Question 4

what kind of fire detection system allows more complete coverage than a spot type system

Answer 4

a continuous loop system

Question 5

what happens if an engine equipped with a thermocouple fire warning system overheat slowly

Answer 5

nothing because a fast temperature rise or rapid heating is required for this type of fire system to operate

Question 6

what electrical power is required for a thermocouple fire protection system to operate

Answer 6

both the thermocouple produced power and the aircraft electrical system are required for this type of fire protection system to operate

Question 7

what is the likely cause of a false fire warning

Answer 7

the engine fire sensing loop is bent or kinked excessively

Question 8

what are fire extinguishing systems designed to do

Answer 8

they are designed to dilute the oxygen levels around the engine to a point that does not allow combustion or to reduce temperatures below the ignition point

Question 9

what elements must be present for a fire to occur

Answer 9

an ignition source such as heat or a spark fuel and oxygen

Question 10

what group of fire extinguishing agents are no longer manufactured because of environmental concerns

Answer 10

halons or freon or cfcs were no longer manufactured after 1995 however existing stocks of cfc may still be used and are subject to strict handling and disposal regulations

Question 11

how are fire extinguishing agents distributed

Answer 11

through perforated tubing and or discharge nozzles

Question 12

what is the purpose of the discharge cartridge and how was it activated

Answer 12

the discharge cartridge or squib which is electrically ignited fires a projectile into the fragile disk thereby releasing the fire extinguishing agent

Question 13

how is a fire extinguisher system with a high rate of discharge classified

Answer 13

as an hrd fire extinguisher system

Question 14

what do the red and yellow discs in a fire extinguishing system indicate

Answer 14

a yellow disk indicates normal discharge a red disk indicates a thermal discharge

Question 15

how is the fire extinguishing agent in an hrd system distributed and how long does it take to discharge

Answer 15

the agent is distributed through a series of high pressure tubes and takes one or two seconds to discharge

Question 16

what is the purpose of a pressure gauge in a fire extinguishing system

Answer 16

indicates pressure within the container to check if the pressure is within limits a pressure temperature chart is used