Engine fire protection systems Flashcards

1
Q

What are the main categories of an engine fire protection system

A

Spot detection, continuous loop, flame detectors

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2
Q

Name examples of spot detection type systems

A

Thermal switch and thermal couple

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3
Q

Name examples of a continuous loop detection system

A

Fenwal, kidde, And pneumatic

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4
Q

When using thermal couple type fire detection systems, what happens if the engine overheat slowly

A

A thermal couple depends on the rate of temperature rise, and will not give a warning if the engine slowly overheat or a short circuit develops

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5
Q

How many thermal couples are required for an engine fire detection

A

Depends on the size of the fire zone and the total circuit resistance

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6
Q

Describe the operation of a kidde Continuous loop fire detector system

A

Has two wires in bedded in a special ceramic core with an inconel tube. One wire acts as an internal ground and the other wire is a hot lead that provides a current.When the ceramic core material heats up the resistance drops, completing the circuit between the internal wires, lighting a light

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7
Q

Where does a thermal couple fire detector system gets its electrical power to operate

A

The thermal couple produces power to close a relay, and power from the aircraft electrical system flows through the relay to the warning light

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8
Q

Describe a thermal switch fire detector system

A

Thermal switch system has one or more lights that are engaged by the aircraft electrical system when a heat sensitive thermal switch closes the circuit at the specific temperature

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9
Q

How are thermal switch is electrically connected in a circuit

A

Connected in parallel with each other but in series with a warning light

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10
Q

What is the most common cause of a false fire warning in a continuous loop detector system

A

Dents, kinks, crushed sensing elements.

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11
Q

Will a continuous loop fire detector still indicate the presence of a fire if the element is broken two

A

Yes

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12
Q

What two methods are used to discharge fire extinguishing agents

A

Mechanical and electrical

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13
Q

What method is used to release the fire extinguishing agent in a typical turbine engine fire protection system

A

Common method is to equip the fire extinguisher in containers with the discharge valves that are operated by electrically discharge cartridges. Squib

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14
Q

What method is used to determine the proper fire extinguisher container pressure

A

Check the container gauge to determine if the pressure is between the prescribed a minimum and maximum limit

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15
Q

What is the color marking used to identify fire extinguishing lines

A

Brown tag with black diamonds

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16
Q

What method other than the pressure gauge is used to indicate low agent pressure in a container

A

Some Aircrafts are equipped it with a low pressure warning light in the cockpit

17
Q

What is the purpose of the yellow and red discharge plugs in the turbine engine fire extinguishing system

A

The yellow plug indicates a pilot initiated discharge. The red plug indicates thermal activated discharge

18
Q

What are the two methods Commonly used to distribute the fire extinguishing agent to the engine

A

A perforated tube or discharge nozzle are used to distribute the agent

19
Q

How does the fire extinguisher agent put out the fire

A

It dilutes the atmosphere so that it will not support combustion

20
Q

What does HRD stand for

A

High rate of discharge

21
Q

How is the fire extinguishing agent distributed from a HRD system

A

It is delivered from open end tubes

22
Q

How long does it take to discharge the extinguishing agent in a HRD system

A

1 to 2 Seconds

23
Q

Which type of fire detection system gives a more complete coverage to a fire hazard

A

Continuous loop system