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?

25
What does a High Rate Discharge system use to deliver?
Open end tube
26
Why is Halon 1301 used
Effective, low toxicity and non corrosive
27
Engine fire protection systems are designed to? (Gases)
Dilute the atmosphere with an inert agent
28
How are fire bottles pressurised?
Nitrogen
29
When can cylindrical shaped fire bottles be used?
When space is limited
30
What is installed in the outlet of the discharge valve assembly?
A cartridge (squib) and frangible disc-type valve
31
How is visual fire bottle pressure given?
Via a vibration resistant helical bourdon type indicator
32
When are two way check valves required in a fire extinguishing systems?
Two shot system, to prevent agent backing up in the reserve container
33
What does the red disc indicate?
Thermal discharge
34
What does the yellow disc indicate?
Pilots have discharged it
35
What fire warning systems are installed?
Visible and audible warning systems are installed in the flight deck to alert the flight crew
36
What happens if both junctions of a thermocouple are heated at the same rate?
No voltage is produced
37
What does the fire detection card monitor the loops for?
- Fire - Overheat - Faults