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OP fire protection

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 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 temperature rate of change whereas thermal switches respond to a specific temperature value.
Briefly describe the components of a kidde continuous loop detection system? A kidde system has an inconel loop whose resistance changes with temperature.
Briefly describe the components and components 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 of the tube, which activates a pressure switch.
Describe the process or mechanism by which a photoelectric smoke detector generates a warning of 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 cell smoke detector be tested? By actuating a test switch.
Name the two types of smoke detection system used in aircraft? Light refraction type {photoelectric}, ionization type.
What are the usual locations where a carbon monoxide detector be installed? In the aircraft cockpit or cabin.
How does a carbon monoxide detector indicate the presence of this deadly gas? The tan spot on the detector turns grey or black.
What are the possible effect of kinks and sharp bends in the sensing element of a fire warning system? False fire warnings caused by a short circuit.
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 basic types of fire extinguishing system? 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 in cabin and engine fires? Halon (halogenated hydrocarbons}, 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 (blow out disc} will release the agent if the bottle agent temperature exceeds a certain limit. This blows out a red indicator disc.
What condition is indicated if the yellow disc 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 disc.
How is the service life of a discharge cartridge calculated? From the date stamped on the cartridge by the manufacturer.
Does a thermocouple fire detection system warn the pilot of a general overheat condition? No, it operates on the rate of temperature rise, and it identifies only a fire.
Does a thermal switch fire detection warn the pilot of a general overheat condition? No, it only actuates when there is a fire.
What is a major disadvantage of “CB” fire extinguishing agent for extinguishing aircraft fires? It is corrosive to aluminum and magnesium.
Why is carbon tetrachloride not recommended as a fire extinguishing agent? Carbon tetrachloride produces phosgene, a deadly gas, when it is exposed to flames.
What happens when the Fire-Pull T-handle is pulled in a jet transport aircraft? Bottle discharge switch uncovered, generator field relay tripped, fuel shut off, hydraulic fluid shut off, bleed air shut off, hydraulic pump low pressure lights shut off.
What is recommended for extinguishing a brake fire? Dry powder.
What precaution must you observe when checking the electrical squib of an HRD fire extinguisher bottle for electrical continuity? It takes only a small amount of current to ignite the powder charge, and the method of testing must not send this amount of current through it.
Created by: g153511
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