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Briefly describe the components of a thermal switch fire detection system.
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Are thermal switches wired in series or in parallel with each other?
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Fire Protection Sys

Airframe 16

QuestionAnswer
Briefly describe the components of a thermal switch fire detection system. Temperature sensitive switches that complete a circuit at a specific temperature and trigger a warning.
Are thermal switches wired in series or in parallel with each other? Parallel
How are the detector units in a double-loop Fenwal system wired? In parallel between two complete loops of wiring.
In what way is a thermocouple fire warning system different from a thermal switch system? Thermocouple systems are sensitive to the rate of temperature change, whereas thermal switch systems respond to a specific temperature value.
Briefly describe the components of a Kidde continuous loop fire detection system. A Kidde system has an inconel tube containing one or more wires embedded in a ceramic core whose resistance changes with temperature.
Briefly describe the components and operation of a Lindberg fire detection system. a stainless steel tube contains an inert gas and a discrete material that absorbs some of the gas. When the tube heats up, some gas is released, raising the pressure in the tube, which activates a pressure switch.
Describe the process or mechanism by which a photoelectric smoke detector generates a warning of a possible fire. Smoke particles refract light in the detector unit causing the photoelectric cell to conduct electricity and trigger the alarm.
How can the operation of a photoelectric smoke detector be tested? By actuating a test switch.
Name two types of smoke detection systems used in aircraft. Light refraction (photoelectric) types and ionization types.
What are the usual locations where a carbon monoxide detector would be installed? In an aircraft cockpit or cabin.
How does a carbon monoxide detector indicate the presence of this deadly gas? The tan spot on the detector turns gray or black.
What are the possible effects of kinks and sharp bends in the sensing element(s) of a fire warning system? False fire warnings caused by short circuits.
How is a Freon container checked for proper pressure? A chart must be used to determine the maximum and minimum gauge pressure readings based on the ambient temperature.
Name the two types of fire extinguishing systems. The conventional system and the high-rate discharge system.
Name the extinguishing agent most commonly used by conventional fire extinguishing systems. Carbon dioxide (CO2).
Name the extinguishing agent most commonly used by high-rate discharge fire extinguishing systems. Halon (Halongenated hydrocarbon type agents), also known as Freon.
How are Freon bottles protected from excessively high temperatures and how can you tell that this has occurred? A thermal fuse (or blowout disk) will release the agent if the bottle temperature exceeds a certain limit. This blows out a red indicator disk.
What condition is indicated if the yellow disk is missing in a fire extinguishing system? The system has been discharged normally.
Describe the mechanism by which a Freon bottle is discharged. An electrical signal fires an explosive squib, which ruptures a frangible disk.
How is the service life of a discharge cartridge calculated? From the date stamped on the cartridge by the manufacturer.
Created by: leimana1
 

 



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