Cabin Atmosphere Control Systems Flashcards

1
Q

How does a continuous flow oxygen system operate ?

A

Oxygen flows from a charged cylinder through a high pressure line to a reducing valve, then to mask outlets

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2
Q

How does basic pressure demand oxygen system operate ?

A

Oxygen flows from a charged cylinder to a pressure demand regulator, on demand from each crew member

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3
Q

What type of oxygen must be used in aircraft ?

A

Aviators Breathing Oxygen

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4
Q

What must be accomplished if an oxygen system had been open to atmosphere for 2 hours or more ?

A

It must be purged to remove moisture

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5
Q

What is used to purge oxygen lines or moisture ?

A

Dry air, Dry nitrogen, or Oxygen

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6
Q

What safety precaution should be observed when servicing oxygen system ?

A

Clean, grease free tools, clothing, hands, no smoking or open flames within 50 feet, do not use adhesive tape of any kind

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7
Q

What are the two groups of independent cabin compressors ?

A

Positive displacement and Centrifugal

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8
Q

What is a Roots blower ?

A

An engine driven compressor, used on old reciprocating engines for cabin pressurization

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9
Q

What method is used by some turbine powered aircraft for pressurization ?

A

Engine bleed air

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10
Q

What pressurization control unit will regulate the position of an outflow valve ?

A

The cabin pressure controller

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11
Q

What is the principal control of a pressurization system ?

A

An outflow valve

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12
Q

What components are used in an air cycle cooling system ?

A

Expansion turbine, heat exchanger, various valves

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13
Q

Describe the basic operating principles that allow an air cycle system to produce cool air ?

A

1 Engine bleed air is cooled primary heat exchanger
2 Compressed air cooled again secondary heat exchanger
3 Air goes to expansion turbine that extracts the energy and pressure of the air dropping the temperature

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14
Q

What causes a temperature drop in an Air cycle cooling system ?

A

The compressed air turns a turbine, then it undergoes a pressure and temperature drop

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15
Q

How does a water separator remove moisture from the air ?

A

The moist air passes through vanes that swirls the air water droplets which are collected and drained

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16
Q

What is a vapor cycle cooling ?

A

A closed system in which freon is circulated through tubing and various components to remove heat from the aircraft

17
Q

In what significant way is a vapor cycle cooling system different from an air cycle cooling system ?

A

Vapor cycle uses freon

18
Q

What components are in a vapor cycle cooling ?

A

Receiver dryer, Evaporator, Compressor, Condenser, Expansion Valve

19
Q

Why is oil added to a vapor cycle freon system ?

A

To seal and lubricate the compressor

20
Q

What is the function of ventilating air in a combustion heater ?

A

It transports heat from the heater into the cabin and prevents combustion gases from entering the cabin if the combustion chamber develops a crack

21
Q

Name several methods used on reciprocating engine aircraft for providing heated cabin air ?

A

Exhaust shroud heat exchangers, combustion heaters and electric heaters

22
Q

What are sources of ventilating air in a combustion heater ?

A

A blower / fan, ram air or possilby a compressor if the airplane is pressuirzed