Engine Fire Protection Flashcards
What types of fire detector systems are used for engine fires?
Overheat, rate of rise and flame detectors
How does a thermal switch fire protection system operate?
When heated past a predetermined temperature, the switch closes, causing the warning device in the cockpit to activate
How many thermal switches are needed in a thermal switch fire protection system?
At least one
What kind of fire protection system allows more complete coverage than a spot type system?
A continuous loop system
What happens if an engine equipped with a thermocouple fire warning system overheats slowly?
Nothing because a fast temperature rise or rapid heating is required for this type of fire system to operate
What electrical power is required for a thermocouple fire protection system to operate?
Both the thermocouple produced power and the aircraft electrical system are required for this type of fire protection system to operate
What is the likely cause of a false fire warning?
The engine fire sensing loop is bent or kinked excessively
What are fire extinguishing systems designed to do?
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
What elements must be present for a fire to occur?
An ignition source such as heat or a spark, fuel and oxygen
What group of fire extinguishing agents are no longer manufactured because of environmental concerns?
Halons or freons 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
How are fire extinguishing agents distributed?
Through perforated tubing and/or discharge nozzles
What is the purpose of the discharge cartridge and how is it activated?
The discharge cartridge, or squib, which is electrically ignited, fires a projectile into the fragile disk thereby releasing the fire extinguishing agent
How is a fire extinguisher system with a high rate of discharge classified?
As an HRD fire extinguishing system
What do the red and yellow discs in a fire extinguishing system indicate?
A yellow disc indicates a normal discharge and a red disc indicates a thermal discharge
How is the fire extinguishing agent in an HRD system distributed and how long does it take to discharge?
The agent is distributed through a series of high pressure tubes and takes one or two seconds to discharge
