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14 Cards in this Set
- Front
- Back
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Can a thermal switch type of fire detection system indicate a general overheat condition? |
No, it is a spot-type sytem |
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Can a thermocouple-type fire detection system indicate a general overheat condition? |
No, measures only rate of temperature rise. |
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How is a thermocouple-type fire detection system checked for operation? |
Current is sent through the heater in the thermal test unit, which closes the sensitive relay, and closes the slave relay which turns on the warning light and bell |
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Does a break in a continuous loop fire detection system keep the system from detecting a fire? |
No, it shows a fault when tested but will still detect a fire |
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Does the pressure type continuous element fire detectors system detect a general overheat condition as well as a fire? |
Yes, it senses temperatures over the entire sensor area which will cause the release of enough gas to close the diaphragm switch and warn of a fire |
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What are the two most commonly used fire extinguisher agents for engine fires? |
Halon 1301 and carbon dioxide |
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What extinguishing agent is used in the high rate discharge fire extinguishing system installed in most turbojet engine installations? |
Halon 1301 |
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What happens when the pilot pulls the fire T-handle in the cockpit of a jet transport airplane? |
The discharge switch is uncovered, generator tripped, fuel supply shuts off to the engine, hydraulic fluid supply to pump shots off, compressor bleed air shuts off, low pressure hydraulic fluid lights turned off |
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How can a mechanic determine the state of charge of a high rate discharge bottle of fire extinguishing agent? |
Using the pressure gauge on the bottle to determine the pressure of the contents in the bottle |
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What method is used to discharge an HRD bottle in a turbine engine installation? |
It is electrically ignited by an explosive powder that blows a knife through the seal to discharge the bottles content |
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Which type of fire detection system operate on the rate of temperature rise? |
Thermocouple system |
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What is indicated if the yellow blowout plug of a fire extinguisher system on the side of an engine nacelle is blown out? |
The extinguishing agent has been discharged by normal operation by the crew |
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What is indicated if the red blowout plug of the fire extinguisher system on the side of the engine nacelle is blown out? |
In indicates the extinguisher has been discharged due to an overheat condition |
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How is the pressure-type-continuous-element fire detection system checked for operation? |
Low voltage alternating current is sent through the detector element through the test switch, it heats up the element and releases enough gas to close the diaphragm switch which sets off the fire alarm |
