Module 15.20 Fire protection systems Flashcards

1
Q

Where would fire detection take place?

A

Fire zone

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2
Q

What is in a fire zone?

A

Detection and/or extinguishing

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3
Q

What are the two major types of turbine failure?

A
  • Thermodynamic
  • Mechanical
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4
Q

Rapid build up go ice on inlet screens or IGV’s can result in what?

A

Severe overheating

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5
Q

Generally most thermodynamic failures are cause by what?

A
  • Ice
  • Excess air bleed or leakage
  • Faulty controls that allow compressor stall or excess fuel
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6
Q

Mechanical failures, such as fractured or thrown blades, can puncture what?

A

The tail cone

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7
Q

What does a complete fire protection system include?

A

Fire detection and extinguishing

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8
Q

How are fires detected?

A

By using one more of the following detectors:
- Overheat
- Rate of rise
- Flame

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9
Q

What are the most common types of detectors?

A

Spot detectors and continuous loop

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10
Q

What detection systems are used on older aircraft?

A
  • Thermal switch
  • Thermocouple
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11
Q

How are thermal switches connected relative to each other?

A

In parallel

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12
Q

What are optical detectors sometimes referred to as?

A

Flame detectors

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13
Q

What do the thermocouple control?

A

Operation of the relay

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14
Q

What do the relays control?

A

The warning lights

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15
Q

What are the two types of optical sensors available?

A
  • Infrared
  • Ultraviolet
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16
Q

When would infrared detectors be used?

A

Light turboprop and helicopter engines

17
Q

What does the integrity switch do?

A

Triggers fault alarm in loss of pressure as in the case of a leak

18
Q

The pneumatic detector has what two sensing functions?

A
  • Average
  • Discrete
19
Q

Average temp sensing is within what range?

A

93℃ to 371℃

20
Q

Both the average and discrete functions are what?

A

Reversible

21
Q

What are the two types of continuous loop detector systems?

A
  • Fenwal
  • Kidde
22
Q

The fenwal system automatically returns to what after extinguishing?

A

Standby alert

23
Q

How do you know there is a fire in continuous loop system?

A

Alarm conditions on both loops

24
Q

How many shots does the APU often have?

A

One shot

25
Q

What does a High Rate Discharge system use to deliver?

A

Open end tube

26
Q

Why is Halon 1301 used

A

Effective, low toxicity and non corrosive

27
Q

Engine fire protection systems are designed to? (Gases)

A

Dilute the atmosphere with an inert agent

28
Q

How are fire bottles pressurised?

A

Nitrogen

29
Q

When can cylindrical shaped fire bottles be used?

A

When space is limited

30
Q

What is installed in the outlet of the discharge valve assembly?

A

A cartridge (squib) and frangible disc-type valve

31
Q

How is visual fire bottle pressure given?

A

Via a vibration resistant helical bourdon type indicator

32
Q

When are two way check valves required in a fire extinguishing systems?

A

Two shot system, to prevent agent backing up in the reserve container

33
Q

What does the red disc indicate?

A

Thermal discharge

34
Q

What does the yellow disc indicate?

A

Pilots have discharged it

35
Q

What fire warning systems are installed?

A

Visible and audible warning systems are installed in the flight deck to alert the flight crew

36
Q

What happens if both junctions of a thermocouple are heated at the same rate?

A

No voltage is produced

37
Q

What does the fire detection card monitor the loops for?

A
  • Fire
  • Overheat
  • Faults