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Module 13 > Air Supply > Flashcards

Air Supply Flashcards

1
Q

Name the 3 bleed air sources for the air conditioning system?

A
  • Engines
  • APU
  • Ground Pneumatic sources
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2
Q

What can supply the Aircraft Cabin with its air supply?

A
  • Air Cond System
  • Mobile Ground Cond Unit
  • Emerg Ram Air System
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3
Q

When should air conditioning packs and air conditioning sources supply an aircraft simultaneously?

A

Never, to prevent excessive airflow and possible air conditioning duct damage

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4
Q

What type of connector is used to supply the aircraft with conditioned air?

A

Bayonet Type with a diameter of 8 inches

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5
Q

For what reason are aircraft fitted with an emergency ram air supply system?

A

To ventilate the cockpit and the cabin if all packs fail or for smoke removal

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6
Q

What type of connector is used to connect Bleed Air sources to the aircraft?

A

Quick release connectors with a diameter of 3 inches

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7
Q

When operating the ram air button, cabin pressure must be?

A

A differential pressure of below 1 PSI

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8
Q

What type of air is the input to the Air Conditioning system?

A

Bleed Air

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9
Q

What should be preferred for longer ground cooling of an aircraft?

A

External air conditioning sources, they are more economical and ecological.

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10
Q

What is another name for the complete cabin atmosphere control system?

A

Cabin Environmental Control System

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11
Q

What conditions must be in normal range to create a comfortable feeling in the cabin?

A

Pressure, Temperature, Humidity and Air Movement.

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12
Q

What temperature should she can be maintained at?

A

21 - 27 Degrees

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13
Q

How does an aircraft supply the cabin with enough oxygen for humans to function?

A

By pressurizing the cabin

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14
Q

Name 3 methods of heat transfer?

A

Conduction, Convection and Radiation

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15
Q

What is one calorie?

A

The amount of heat energy needed to raise the temp of 1 gram of pure water to 1 Degree Cent

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16
Q

What is one BTU (British Thermal Unit)?

A

The amount of heat energy needed to raise the temp of 1 pound of pure water to 1 Degree Farenheight

17
Q

A pan of water is put on a stove and heated, its temp will increase but the water will remain a liquid, this is an example of?

A

Sensible heat

18
Q

What is the function of the thermal expansion valve in the vapour cooling system?

A

regulates the amount of liquid refrigerant flowing into the evaporator.

19
Q

What are the two types of compressors used in refrigeration systems?

A

Piston (small A/C) Radial (Bigger A/C)

20
Q

What should be done in an vapour cycle cooling system to protect the compressor?

A

All refrigerant should be vaporized

21
Q

What is another name for an air cycle machine?

A

Air Conditioning Pack

22
Q

An Air cycle machine consists of a ……………. which drives a …………. via a common shaft?

A

Turbine, compressor and a cooling fan

23
Q

In an air conditioned pack the air from the pneumatic system is cooled to a usable temp of?

A

Between 2 and 60 Degrees

24
Q

Which unit in the Air Cycle Machine is used to remove moisture from the air?

A

Water Separator

25
Q

Why is there a cooling fan driven by the shaft of an Air Cycle Machine?

A

To provide assistance to the airflow. If ram airflow is higher than the cooling fan delivers the Fan Bypass Check Valve is opened.

26
Q

When routing ducts what must be taken into consideration?

A

Expansion and Contraction through heating

27
Q

There are 2 main types of flow control valves, these are?

A

Flow control Valves to regulate constant airflow and flow control valves to regulate variable airflow.

28
Q

Why is a cabin pressure reference signal used to control a flow control valve?

A

Airflow measuring devices are mass flow meters, therefore it needs a reference signal (cabin pressure) to regulate a specific volumetric airflow.

29
Q

What is the pack outlet temp and why?

A

0 -64 Degrees C to prevent icing or overheating of the Air Cycle Machine

30
Q

What valve will automatically close if in a zone supply duct an overheat condition is detected?

A

Trim Air Pressure Regulator Valve

31
Q

Why is zone supply temp limited to a maximum value?

A

To 74 Degrees C to prevent damages of the zone supply ducts and a possible bad smell in the cabin

32
Q

What is cabin Climb rate and Decent rate limited to?

A

500ft/min and 300ft/min

33
Q

At what cabin altitude will a intermittent warning sound be heard in the flight deck?

A

10000 Feet

34
Q

If a cabin climbs >3100ft/min or descends >2000ft/min this is?

A

Excessive cabin rate

35
Q

Why must air conditioning packs be supplied with hot air only?

A

Otherwise freezing and damage of turbine may occur

Module 13 (22 decks)

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