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Module 15 - Gas Turbine Engines > 15.20 - Fire Protection Systems > Flashcards

15.20 - Fire Protection Systems Flashcards

1
Q

What are the three parts of the fire triangle?

A

Heat, fuel and oxygen

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2
Q

What are the two types of continuous loop detectors?

A 
Resistance type (- with temp)
Capacitance type (+ with temp)
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3
Q

What happens to resistance in the resistance type loop detector as the temperature increases?

A

It decreases

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4
Q

What happens to capacitance with an increase in temperature in a capacitance loop detector?

A

It increases

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5
Q

How does heat affect a bi-metallic strip?

A

The strip heats up and makes contact in the switch which completes the circuit

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6
Q

What are the two main continuous loop detector systems?

A

Fenwall and Kidde

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7
Q

What are the two types of gas (pneumatic)fire detectors?

A

Lindberg system and the systron-donner system

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8
Q

How does a pneumatic fire detection system work?

A

The gas inside is stable at low temperatures. It is released at higher temperatures and closes a pressure switch at a predetermined value.

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9
Q

What gasses are used in the Systron-donner type fire detection system?

A

Hydrogen and helium

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10
Q

Will you get a false alarm with a pneumatic fire detection system?

A

No, it will provide a loop fault message

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11
Q

How often should the detectors be clipped in when installed?

A

Every 6-inches

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12
Q

What could excessive bending do to a detector installation?

A

It could work-harden the capillary, causing it to break

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13
Q

What are the main causes of false fire workings?

A

Ingress of moisture
Faulty installation
Lack of cleanliness

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14
Q

When inspecting a fire detection system, what checks/tests are done?

A

Acceptance checks (when checked after transit) and Functional tests.

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15
Q

How is the function check completed on a resistance type fire protection system?

A

The centre electrode is grounded

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16
Q

How is the function check completed on a capacitance type fire protection system?

A

Additional capacitance is introduced into the circuit

17
Q

Is any work on dressings dents, gouges, kinks permitted on fire wire?

A

No. No dressing is permitted. It should be replaced

18
Q

What type of brush should be used on fire detection systems?

A

Camel hair brush

19
Q

Why is normal compressed air not used for drying, newly cleaned fire wire?

A

It can contain moisture or oil, so nitrogen or dry bottled air cans are used.

20
Q

What is the type of fire detection system you would find on a Boeing or Airbus?

A

Systron Donner system.

21
Q

How many serviceable loops need to signal a fire?

A

Both loops. It will decrease to one loop if one of the loops is detected as unserviceable.

22
Q

Why are halogenated hydrocarbon compounds banned for use?

A

They destroy the ozone layer in the atmosphere.

23
Q

How does HFC-125 suppress a fire?

A

It absorbs heat energy faster than the heat can be generated.

24
Q

The most modern fire extinguisher bottles do not have a pressure gauge, how would you know how much is in there?

A

By removing it from the aircraft and weighing it.

25
Q

What gas is charged in an aircraft fire extinguisher bottle?

A

Nitrogen gas at 600psi at 15 degrees C

26
Q

What is a fire extinguisher cartridge also known as?

A

A squib

27
Q

What is special about the APU fire protection system on the ground?

A

It is automatic and will release the agent

28
Q

What are the 3 types of engine bottle discharge indicators?

A

Mechanical indicators (protruding indicators on the cap)
Pressure gauges
Busting Disc

29
Q

What is the purpose of a compensating resistor in a thermocouple temperature sensing system?

A

It corrects for varying ambient temperatures at the cold junction

30
Q

Can thermocouple leads be installed either way round?

A

No, they are designed for a specific installation and may not be altered

31
Q

How are dissimilar metals in a thermocouple connected?

A

By welding of the two metals

32
Q

What is a fire detection system that has a single wire surrounded by ceramic beads?

A

Fenwall system

33
Q

How is the fire extinguishing agent distributed in the engine?

A

Spray nozzles and perforated tubing

34
Q

What is a spot detector?

A

A bi-metallic strip that when heated, closes the contact & produces a warning

Module 15 - Gas Turbine Engines (22 decks)

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