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M11 > 11.4 Air Conditioning > Flashcards

11.4 Air Conditioning Flashcards

1
Q

Does atmospheric pressure increase or deafness with increase in altitude?

A

Atmospheric pressure decreases

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2
Q

What altitude do modern aircraft operate at?

A

40,000ft

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3
Q

What’s the maximum cabin altitude during flight?

A

8,000ft

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4
Q

What is the positive cabin rate?

A

Don’t exceed 500ft per minute

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5
Q

What is the negative cabin rate?

A

Don’t exceed 300ft per minute

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6
Q

What happens when cabin pressure increases to 10,000ft?

A

Crew put oxygen masks on

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7
Q

What happens when cabin pressure increases to 14,000ft?

A

Oxygen masks come down from passenger cabin ceiling

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8
Q

What happens when cabin pressure increases to 15,000ft?

A

Outflow valves close automatically

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9
Q

To prevent differential pressure what happens?

A

Two saftey valves
- positive and negative pressure relief valves

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10
Q

What three modes does the cabin pressurisation system have?

A

Automatic
Semi- Automatic
Manual

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11
Q

What does the ditching push button do?

A

Isolates the cabin from any water entering during an emergency landing (closes all valves)

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12
Q

An outflow valve normally has…?

A

3 motors
2 AC
1 DC

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13
Q

When cabin pressurisation system is switches to manual mode, what motor is used?

A

DC motor

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14
Q

During pressure leakage test what is cabin pressurised to?

A

4 psi above ambient pressure

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15
Q

What is the minimum number of sensors you can have in a pack?

A

3

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16
Q

What system reduces the operational costs of air conditioning?

A

Recirculation system

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17
Q

What is required to compensate for different cooling and heating effects?

A

A zone temperature control system

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18
Q

In an emergency how do you use air conditioning?

A

Emergency ram air inlet

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19
Q

What is the purpose of the trim air valve ?

A

Controls the amount of hot air that is mixed with cold supply air

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20
Q

Where is a separate ventilation system used?

A

Galleys and lavatories

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21
Q

What is the main air source?

A

Engine compressor

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22
Q

What temperature do the electrical heaters automatically switch in?

A

Below 7 degrees C

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23
Q

What are the 4 different cargo ventilation types?

A
  • non ventilation
  • ventilation and heated
  • ventilation and unheated
  • air conditioned cargo
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24
Q

What does HP mean?

A

Hugh pressure

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25
Q

What does IP mean?

A

Intermediate pressure

26
Q

When is HP compressor used?

A

When low engine RPM

27
Q

When is IP compressor used?

A

When high engine RPM

28
Q

What does the bleed air valve do?

A

It regulates pressure to maintain a constant level of pressure

29
Q

What can source air supply?

A
  • engine
  • APU
  • external air supply
  • high pressure ground connection
30
Q

Why do we need air conditioning?

A
  • provide temperature control
  • ventilation
  • pressurisation of the cabin
31
Q

What are the air ducts monitored by?

A

Leak detection system

32
Q

What temperature must the air be under when coming from the engine?

A

200 degrees c

33
Q

What do you use to cool down air at bleed valve?

A

Precooler from fan air

34
Q

How are non pressurised areas separated?

A

Pressure bulkheads

35
Q

What areas aren’t pressurised?

A
  • radome
  • landing gear
  • tailcone
36
Q

What is ideal cabin altitude?

A

2500- 8000ft

37
Q

What does pressure differential mean?

A

The difference between cabin and ambient pressure

38
Q

What’s a disadvantage of a heat exchanger?

A

Not enough power to cool all of cabin air

39
Q

How does a heat exchanger work?

A

One fluid passes through a tube while another fluid circulates around the partitions
- allows for heat exchanges without fluids mixing together

40
Q

How do we clean the air in the cabin?

A

Air filters

41
Q

What is the allowable temperature within the cabin?

A

18- 30 degree C

42
Q

What does the regulation sauna single person needs to be supplied with fresh air?

A

0.283 cubic meters per minute per person

43
Q

What 5 things must you ensure about the air in the cabin?

A
  • fresh
  • clean
  • comfortable temperature
  • correct humidity
  • correct pressure
44
Q

What are 2 characterises of air going to an air cycle machine?

A

High pressure and hot

45
Q

What is the function of a cooling pack?

A

Cool hot bleed air to a valve given by the pack controller

46
Q

What are air cycle machines driven by?

A

Turbines

47
Q

What is a basic cycle for an air cycle machine?

A
  1. Hot air flows to compressor
  2. Then hot, high pressure air flows to heat exchanger
  3. ambient air flows across, decreasing the temperature, but pressure stays the same.
  4. Then flows to the turbine, where it expands and cools again
  5. Then cold air goes into the cabin
48
Q

What is the basic series for a vapour system?

A
  1. An expansion valve expands a special pressurised cooling fluid
  2. Resulting in fluid becoming cold
  3. This cold fluid flows through an evaporator which is heated by cabin air, which flows across the evaporator
  4. Therefore reducing cabin air temperature
49
Q

What is the purpose of the pack valve

A

Determines the amount of air going into the cabin

50
Q

What is the purpose of the check valve?

A

Prevents back flow into the pack

51
Q

What is the purpose of the water separator?

A

Remove moister from bleed air and anti - ice valve

52
Q

What is the purpose of the ozone converter?

A
  • Helps maintain a health cabin and provide comfort for passengers and crew
  • prevent jet lag or air sickness
53
Q

What is the reason for a fan in the ram air?

A

For when on the ground as there is no ram effect

54
Q

What are the 3 primary components of an air cycle system?

A

Compressor, turbine and fan

55
Q

What type of inlet is the ram air inlet?

A

NACA type air inlet

56
Q

What type of valve is the bypass valve?

A

Butterfly valve

57
Q

What is the purpose of the bypass valve?

A

Adjust the temperature in the pack

58
Q

What is the normally temperature and PSI of the air that goes into the pack valve?

A

200 degrees c
45 PSI

59
Q

What type of bearings are used in an air cycle machine?

A

Air bearings

60
Q

What 4 things does a vapour cycle system pass through?

A
  1. Expansion valve
  2. Evaporator
  3. Compressor
  4. Condenser

M11 (41 decks)

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