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M11 > 11.8 Fire Systems > Flashcards

11.8 Fire Systems Flashcards

1
Q

What are the two parts of fire protection?

A

. Fire detection system
. Fire extinguishing system

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2
Q

Where must fire detection systems always operate?

A

. Engines and APU

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3
Q

What does a spot sensor use for its switch for fire detection?

A

Bi - metallic switch

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4
Q

What are the two different continuous loop fire detection sensors?

A

. Semi conductor loop
. Pneumatic pressure loop

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5
Q

What are the 4 manufacture names for semi conductor loops?

A

. Kiddle
. Graviner
. Edison
. Fenway

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6
Q

How does a pneumatic pressure loop work?

A

. Sealed tube of gas
. Pressure of gas increases at high temps
. Gas operates a pressure switch at high pressure levels

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7
Q

What are the two names for pneumatic pressure loop?

A

. Systron
. Donner

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8
Q

What are the two different types of smoke detectors?

A

. Optical type
. Ionisation type

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9
Q

Where are smoke detectors used?

A

. Cargo compartments
. Toliets
. Avionics compartments

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10
Q

For a fire warning what would illuminate?

A

On overhead panel a red fire warning - local warning

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11
Q

How is the centralised warning cancelled?

A

By pressing the master warning light when pilot has identified the warning

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12
Q

What two functions does the fire detection system have?

A

. Receive electrical signals from sensors
. Test functions

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13
Q

What system is a fault detection system?

A

Loop system

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14
Q

What system prevent a false fire warning because of faliure?

A

Dual loop system

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15
Q

What are the two types of continuous loops on engines?

A

. Semi conductor
. Pneumatic pressure valve

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16
Q

What colour is the local fire detection warning?

A

Red light

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17
Q

What are the two features of an APU fire detection system?

A

. Ground warning in nose/ main wheel and red light flashes/ warning horn sounds
. APU auto shutdown and auto extinguished

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18
Q

Where is the wheel well fire detection system installed?

A

In wheel wells which are braked

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19
Q

Where is the wheel wheel fire detection system only required?

A

Only in an aircraft that has no individual brake temp indication/ warning system

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20
Q

What are the two types of sensors used for pneumatic duct leaks?

A

. Spot sensors
. Semi conductor continuous loop

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21
Q

Where does the local warning for pneumatic duct leak appear?

A

On pneumatic or air conditioning panel

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22
Q

Explain class A cargo smoke detection system

A

. NO fire detection or extinguish because flight deck can see that area
( baggage compartment/ wardrobe)

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23
Q

Explain class B cargo smoke detection system

A

. Fire detection necessary as ventilatied
. No extinguish as can manually fight
( lower or upper deck that is accessible during flight)

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24
Q

Explain class C cargo smoke detection system

A

. Fire detection necessary
. Extinguish system necessary
( lower and upper deck that is NOT accessible during flight)

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25
Q

Explain class D cargo smoke detection system

A

Until year 2003 fire detection and extinguish weren’t needed
Now both are needed - same as class C

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26
Q

Explain class E cargo smoke detection system

A

.fire detection
No extinguish
( access is possible during flight)

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27
Q

What is required for a lavatory?

A

Smoke detection system

28
Q

How many smoke detectors does the avionics smoke detection system have?

A

1 smoke detector

29
Q

What is a semiconductor loop made of?

A

Stainless steel

30
Q

What are the 3 manufacturers of a single wire semiconductor?

A

. Fenewal
. Graviner
. Edison

31
Q

Ahi is the manufacture of a semi conductor loop with two internal wire?

A

Kidde

32
Q

What do the semi conductor resistors work on?

A

Negative temperature coefficient

33
Q

When there is a fire the ohums decreases to what for an alarm to be triggered?

A

Below 500 ohums

34
Q

What loop circuit does a fire detection system follow to prevent miss detection?

A

Closed loop

35
Q

If only 1 loop reports, what will the pilot get?

A

Loop fault message

36
Q

What is max and min bend radius if semi conductor loop?

A

Max = 3.2mm
Min = 25.4mm

37
Q

What are the 2 different smoke detector types?

A

. Optical
. Ionisation

38
Q

When would an optical type detector set off the alarm?

A

When smoke in detector, the light is reflected and lights up the photo resistor causing a decrease is in resistance which sets off an alarm

39
Q

How does the ionisation type smoke detector detect smoke?

A

By analysing the composition of air because of different mass of molecules

40
Q

IAW ionisation type smoke detector what is heavier, clean air or smoke air?

A

Smoke air is heavier

41
Q

What smoke detector uses a radiation source?

A

Ionisation type

42
Q

Why should you never open ionisation smoke detector?

A

Because has radiation inside so can cause damage

43
Q

What are the advatanges of halon?

A

. Only small amount needed as causes a chemical reaction
. Not chemicaly conductive
. Does not reduce visibility

44
Q

What three fires can halon be used in?

A

A,B,C

45
Q

What must you do to check portable fire extinguisher?

A

. check overhaul date
. Check not used - pressure gauge in green band and saftey pin in

46
Q

What is halon 1301 pressurised by and too?

A

Nitrogen and 600 psi

47
Q

What is the life of a discharge cartridge?

A

10 year

48
Q

How must you handle the discharge cartridge?

A

With special care

49
Q

What prevents over pressure of fire extinguisher?

A

Frangible disc breaks when the pressure inside bottle reaches 1700psi

50
Q

What colour disc will be missing in fuselage if thermal fuse is used?

A

Red disc

51
Q

What colour disc is pushed out if extinguisher is discharged via spray nozzles?

A

Yellow disc

52
Q

What is unique about a hot battery bus?

A

It is always powered by batteries

53
Q

What must you do before maintaining the firing circuit?

A

Pull the cbs of firing circuit

54
Q

What would be the result if squib circuit is broken?

A

No result of squib test

55
Q

When pushing fire button or pull T handle what happens?

A

Extinguisher firing circuit is armed

56
Q

When pushing fire button or pull T handle what happens?

A

Extinguisher firing circuit is armed

57
Q

is number 1 bottle in engine is discharged what colour does it show when it’s empty?

A

Amber

58
Q

If fire is still going after 30s what must you go?

A

Discharge second bottle

59
Q

What prevents the refilling of an empty first bottle

A

Check valve

60
Q

What system do engine extinguishers work on?

A

2 shot

61
Q

What fire extinguisher do APU work on?

A

1 shot system

62
Q

What is different for APU on ground?

A

Auto shut off when fire warning on ground
And after 3s after the extinguisher is fired off

63
Q

During an APU fire test what happens?

A

Does not activate auto shut down or auto extinguishing

64
Q

In a cargo compartment fire, when is second bottle fired?

A

After time delay of several minutes

65
Q

Is the lavatory system manual or auto?

A

Automatic

66
Q

What temp does the fusible end cap melt on lavatory system?

A

80 degrees C

67
Q

What does it mean when you see a black temp patch?

A

Bottle is discharged and needs to be removed for weight check

M11 (41 decks)

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