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Mod 11 > 11.4 Air Conditioning > Flashcards

11.4 Air Conditioning Flashcards

1
Q

Air supply sources

A

Engine
APU
ground pneumatic cart

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2
Q

Emergency ram air system purpose

A

Ventilate cockpit and cabin if all packs fail

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3
Q

ATA 36

A

Pneumatics

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4
Q

ATA 21

A

Air con

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5
Q

HEPA

A

High efficiency perticulate air filter

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6
Q

Ideal temp

In cabin

A

Between 70 and 80f

Or 21 and 27c

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7
Q

Ideal humidity

A

30%

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8
Q

How many pounds of fresh air per minute in cabin

A

0.55lbs fresh air per person per minute

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9
Q

HEPA filter efficiency

A

85 to 99.995%

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10
Q

Aircraft cooling systems

A
  • Vapour cycle cooling system( small aircraft)

* air cycle cooling system ( large aircraft)

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11
Q

Vapour cycle cooling system systems:

• compressor

A

When vapour compressed its pressure and temp increases

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12
Q

Vapour cycle cooling system systems:

• condenser

A

Condenses hot refrigerant gas from compressor

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13
Q

Vapour cycle cooling system systems:

• the reciever dryer

A

Serves as resevoir for liquid refrigerant

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14
Q

Vapour cycle cooling system systems:

• the theromostatic expansion valve

A

Regulates the amount of liquid flowing into evaporator

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15
Q

Vapour cycle cooling system systems:

• the evaporator

A

Absorbs the heat of aircraft cabin into refrerant . As heat abaorbed the refrigerant evaporates

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16
Q

Vapour cycle cooling system systems:

• refrigerant

A

You want a refrigerant with low boiling point so it turns to vapour quicker

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17
Q

Air cycle cooling system

A

AKA air conditioning packs , installed in newest aircraft

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18
Q

Air cycle cooling system ( systems )

• flow control valve

A

AKA pack valve

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19
Q

Air cycle cooling system ( systems )

• air cycle machine (ACM)

A

Consists of turbine which drives compressor , compressor increases pressure and temp

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20
Q

Air cycle cooling system ( systems )

• turbine by pass valve

A

Controls pack outlet temp

• AKA temp control valve

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21
Q

Air cycle cooling system ( systems )

• water seperator valve

A

Collects excess moisture before it enters the cabin

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22
Q

Air cycle cooling system ( systems )

• pack anti ice valve

A

Removes and prevents ice at turbine outlet and water seperator

23
Q

Air cycle cooling system ( systems )

• ram air inlet and outlet doors

A

Used to control amount of cooling airflow across the heat exchanger

24
Q

Air cycle cooling system ( systems )

• fan bypass check valve

A

It opens if amount of ram airflow is higher than the cooling fan delivers

25
Q

Where is aircraft most efficient

A

High altitude

26
Q

Cabin climb rate?

A

500 feet per minute (max)

27
Q

Descent rate?

A

300 feet per minute (max)

28
Q

How is cabin altitude measured

A

Adding ambient pressure to pressure inside aircraft

29
Q

Where is outflow valve when plane is landed?

A

Fully open

30
Q

Pressurisation control systems:

• outflow valve

A

• Modulates cabin air

31
Q

Pressurisation control systems:

• pressure controller

A

Provides control signals to the outflow valve ac motors

32
Q

Pressurisation control systems:

• control panel

A

Contains all necessary selectors and indicators for the fligjt crew to operate the pressurisation system.

33
Q

Excessive rate of cabin altitude:

A

Greater than 3100 feet per minute or descend greater than 2000 feet per minute

34
Q

Safety and warning devices:

• pressure relief valves

A

Designed to open if too much pressure difference

35
Q

Safety and warning devices:

• negative relief valves

A
  • AKA vacuum relief valves

* equalise a possible negative pressure difference duriny descent

36
Q

Safety and warning devices:

• pressure system monitoring

A
  • At 10,000 feet warning for cabin altitude

* at 14,000 oxygen masks drop

37
Q

Purpose of emergency ram system

A

Ventillate cockpit if packs fail

38
Q

Why cant air con packs be used at the same time

A

High cabin airflow may damage the air con ducts

39
Q

What component extracts cabin air

A

Evaporator

40
Q

Max pressure in aircraft is determined by?

A

Strength of cabin

41
Q

To decrease cabin altitude:

A

Outflow valves must be closed

42
Q

Purpose of pack valves

A

Allows certain amount of bleed air from engine through to the pack system and as trim air

43
Q

% of air recirculated

A

30-55

44
Q

How is temp in cabin controlled

A

Through a pack : vapour syetem, air cooling system

45
Q

What is charge air

A

Bleed air from engine

46
Q

What is ram air

A

Air used to cool packs

47
Q

Boot strap system?

A

Pack system ( air cycle cooling system )

48
Q

How is air distributed into cabin and cargo bays

A

Exit louvers

49
Q

Location of trim air valve

A

Downstream of the packs

50
Q

Components of air cycle machine (acm)

A

Turbine , compressor , cooling fan

51
Q

Purpose of thermostatic expansion valve

A

Regulate liquid flowing into evaporator

52
Q

What controls cabin pressure

A

Outflow valve

53
Q

Purpose of dessicant in reciever dryer?

A

Absorbs moisture from refrigerant

54
Q

Purpose of turbine

A

Drives compressor

Mod 11 (19 decks)

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