Airframe 16
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
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| 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.
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| Are thermal switches wired in series or in parallel with each other? | Parallel
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| How are the detector units in a double-loop Fenwal system wired? | In parallel between two complete loops of wiring.
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| 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.
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| 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.
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| 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.
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| 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.
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| How can the operation of a photoelectric smoke detector be tested? | By actuating a test switch.
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| Name two types of smoke detection systems used in aircraft. | Light refraction (photoelectric) types and ionization types.
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| What are the usual locations where a carbon monoxide detector would be installed? | In an aircraft cockpit or cabin.
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| How does a carbon monoxide detector indicate the presence of this deadly gas? | The tan spot on the detector turns gray or black.
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| 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.
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| 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.
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| Name the two types of fire extinguishing systems. | The conventional system and the high-rate discharge system.
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| Name the extinguishing agent most commonly used by conventional fire extinguishing systems. | Carbon dioxide (CO2).
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| Name the extinguishing agent most commonly used by high-rate discharge fire extinguishing systems. | Halon (Halongenated hydrocarbon type agents), also known as Freon.
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| 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.
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| What condition is indicated if the yellow disk is missing in a fire extinguishing system? | The system has been discharged normally.
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| Describe the mechanism by which a Freon bottle is discharged. | An electrical signal fires an explosive squib, which ruptures a frangible disk.
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| How is the service life of a discharge cartridge calculated? | From the date stamped on the cartridge by the manufacturer.
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Created by:
leimana1