Subject I - Engine Fire Protection Systems Flashcards
- What are the main categories of engine fire protection systems?
Spot-detection, Continuous-loop, and flame detectors
- Name examples of spot-detection type systems.
Thermal switch and thermocouple
- Name examples of continuous-loop detection system.
Fenway (one “L” one wire), Kidde (two “Ds” two wires), and pneumatic
- When using a thermocouple type fire detector system, what happens if the engine overheats slowly?
Depends on rate of temp rise, no warning for slow overheat or short circuit.
- Describe the operation of a kiddy continuous loop fire detector system.
Two wires in a ceramic core within a Inconel tube. When heated its resistance drops, completing the circuit and lighting a light.
- Where does a thermocouple fire detector system get its electrical power to operate?
Thermocouple produces power to close a relay, and aircraft electrical system flows through the relay to the warning light.
- Describe a thermal switch fire detector system?
Heat sensitive thermal switch closes the circuit at a specific temperature.
- How are thermal switches electrically connected in the circuit?
In parallel with each other but in series with the warning light.
- What is the most common cause of a false fire warning in a continuous loop detector system?
Dents, kinks, or crushed sensing elements.
- Will a continuous loop fire detector still indicate the presence of a fire if the element is broken in two?
Yes
- What two methods are used to discharge fire extinguishing agents?
Mechanical and electrical
- What method is used to release the fire extinguishing agent in a typical turbine engine fire protection system?
Electrically discharged or breakable disc is ruptured by explosive cartridge.
- What method is used to determine proper fire extinguisher container pressure?
Check gauge that pressure is between min and max limits.
- What is the color marking used to identify fire extinguishing lines?
Brown tag with a row of black diamonds.
- What method other than the pressure gauge is used to indicate low agent pressure in a container?
Low pressure warning light in the cockpit.