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18 Cards in this Set
- Front
- Back
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What types of fire detector systems are used for engine fire detection? |
Overheat detector systems, rate of rise, detector systems, and flame detector systems |
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How does a thermal switch fire protection system operate? |
When heated past the predetermined temperature, the switch closes causing a warning device in the cockpit to activate. |
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How does induction icing affect engine performance? |
It causes a reduction in power and possible erratic operation. |
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How many thermal switches are needed in a thermal switch fire protection system? |
At least one. |
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What kind of fire detection system allows more complete coverage than a spot-type system? |
A continuous loop system. |
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What happens if an engine equipped with a thermocouple fire warning system overheats slowly? |
Nothing, because a fast temperature rise or rapid heating is required for this type of fire system to operate. |
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What electrical power is required for a thermocouple fire protection system to operate? |
Both the Thermocouples produced power, and the aircraft electrical system are required for this type of fire protection system to operate. |
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What is the likely cause of a false fire warning? |
A kink or a bend on the fire sensing loop. |
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What are fire extinguishing Systems designed to do? |
They are designed to dilute the oxygen levels around the engine to a point that does not allow combustion, or reduces temperature below the ignition point |
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Describe how a Kidde and Fenwal continuous loop fire protection system functions? |
A. Kidde is made up of sensing elements consisting of sealed inconel tubes with two conductors that are embedded in the thermistor material. One wire is electrically grounded to the outer tube at each end and acts as an internal ground, and the other wire is a positive lead. When a fire or overheat condition occurs it causes the resistance of the thermistor material to drop thus allowing current to flow between the two wires activating the alarm. Fenwal system uses a sensing element consisting of a small diameter Flexible inconel tube containing a single wire electrode surrounded by ceramic beads. The beats prevents the electorate and the tube from touching each other. When a fire or overheat condition occurs, the core resistance of the ceramic beads drops thus allowing current to flow between the center electrode and ceramic beads and the grounded electrode to the aircraft structure, energizing the alarm system. |
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What elements must be present for a firer to occur? |
An ignition source such as heat or spark, fuel and oxygen. |
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What group of fire extinguishing agents are no longer manufactured because of environmental concerns? |
Halons or Freon the brand name or chlorofluorocarbons (CFC) |
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How are fire extinguishing agents distributed? |
Through perforated tubing or discharge nozzles. |
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What is the purpose of the discharge cartridge or squib, and how is it activated? |
It is an electrically ignited projectile that fires through the frangible disk to release the extinguishing agents. |
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How is a fire extinguisher system with a high rate of discharge classified? |
As a high rate of discharge (HRD) extinguisher system. |
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What do the red and yellow discs in the fire extinguisher system indicate? |
A yellow disk indicates a normal discharge and the red disk indicates a thermal discharge. |
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How is the fire extinguishing agent in an HRD system distributed and how long does it take to discharge? |
It is distributed through a series of high pressure tubes. It takes about 1 to 2 seconds to discharge. |
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What is the purpose of a pressure gauge in a fire extinguishing system? |
It indicates the pressure within the container, to check if the pressure is within limits a pressure temperature chart is used. |
