Subject I - Engine Fire Protection Systems Flashcards

1
Q
  1. What are the main categories of engine fire protection systems?
A

Spot-detection, Continuous-loop, and flame detectors

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2
Q
  1. Name examples of spot-detection type systems.
A

Thermal switch and thermocouple

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3
Q
  1. Name examples of continuous-loop detection system.
A

Fenway (one “L” one wire), Kidde (two “Ds” two wires), and pneumatic

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4
Q
  1. When using a thermocouple type fire detector system, what happens if the engine overheats slowly?
A

Depends on rate of temp rise, no warning for slow overheat or short circuit.

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5
Q
  1. Describe the operation of a kiddy continuous loop fire detector system.
A

Two wires in a ceramic core within a Inconel tube. When heated its resistance drops, completing the circuit and lighting a light.

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6
Q
  1. Where does a thermocouple fire detector system get its electrical power to operate?
A

Thermocouple produces power to close a relay, and aircraft electrical system flows through the relay to the warning light.

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7
Q
  1. Describe a thermal switch fire detector system?
A

Heat sensitive thermal switch closes the circuit at a specific temperature.

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8
Q
  1. How are thermal switches electrically connected in the circuit?
A

In parallel with each other but in series with the warning light.

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9
Q
  1. What is the most common cause of a false fire warning in a continuous loop detector system?
A

Dents, kinks, or crushed sensing elements.

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10
Q
  1. Will a continuous loop fire detector still indicate the presence of a fire if the element is broken in two?
A

Yes

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11
Q
  1. What two methods are used to discharge fire extinguishing agents?
A

Mechanical and electrical

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12
Q
  1. What method is used to release the fire extinguishing agent in a typical turbine engine fire protection system?
A

Electrically discharged or breakable disc is ruptured by explosive cartridge.

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13
Q
  1. What method is used to determine proper fire extinguisher container pressure?
A

Check gauge that pressure is between min and max limits.

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14
Q
  1. What is the color marking used to identify fire extinguishing lines?
A

Brown tag with a row of black diamonds.

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15
Q
  1. What method other than the pressure gauge is used to indicate low agent pressure in a container?
A

Low pressure warning light in the cockpit.

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16
Q
  1. What is the purpose of the yellow and red discharge plugs (disks) in a turbine engine fire extinguishing system?
A

Yellow plugs pilot initiated discharge.
Red plug thermal activated discharge.

17
Q
  1. What are two methods commonly used to distribute the fire extinguishing agent to the engine?
A

A perforated tube or discharge nozzles

18
Q
  1. How does the fire extinguishing agent put out the fire?
A

Dilutes the atmosphere so that it will not support combustion.

19
Q
  1. What does “HRD” stand for?
A

High rate of discharge

20
Q
  1. How is the fire extinguishing agent distributed from the HRD system?
A

Delivers from open end tubes

21
Q
  1. How long does it take to discharge the extinguishing agent in a HRD system?
A

It only takes 1 to 2 seconds.

22
Q
  1. Which type of fire detection system gives a more complete coverage to a fire hazard?
A

A continuous loop system.