Cabin Atmosphere Control Systems Flashcards

1
Q

What is the principle control element in a cabin pressurization system?

A

The cabin outflow valve.

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2
Q

What is the purpose of the negative pressure relief valve in the pressurization system?

A

The negative pressure relief valve prevents accidentally obtaining a cabin altitude which is higher than the altitude of the aircraft.

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3
Q

What control changes the position of the outflow valve?

A

The pressurization controller is the source of control signals for the pressurization system.

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4
Q

What are the two groups of independent cabin compressors?

A

They are positive displacement compressors and centrifugal compressors.

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5
Q

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

A

Bleed-air from the engine compressor is used for pressurization.

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6
Q

What limits the degree of cabin pressurization?

A

The structural design features of the fuselage, and by the capacity of the superchargers to maintain a constant volume of airflow to the fuselage.

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7
Q

What are three methods of supplying heat to the conditioned air when the “heat of compression” is not sufficient for this purpose?

A

Gasoline combustion heaters, electric heaters, and exhaust gas air-to-air heat exchangers.

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8
Q

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

A

Ventilating air is used to carry the heat to the places where it is needed.

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9
Q

What are the sources for ventilating air?

A

A blower for air circulation and heater operation on the ground, and a ran-air inlet, or the cabin compressors on pressurized aircraft.

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10
Q

What are the components of an air cycle cooling system?

A

An expansion turbine (cooling turbine), an air-to-air heat exchanger, and various valves which control airflow through the system.

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11
Q

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

A

As the compressed air passes through the expansion turbine it performs the work of turning the turbine and undergoes a pressure and temperature drop.

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12
Q

What are the components in a vapor cycle (freon) cooling system?

A

The compressor, the condenser, the expansion valve, and the evaporator.

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13
Q

How do you determine the liquid level in a vapor cycle cooling system?

A

Operate the system for approximately 5 minutes to reach a stable condition and then observe the flow of freon through the sight glass. A steady flow indicates that a sufficient charge is present. If the freon charge is low, bubbles will appear in the sight glass

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14
Q

What is a continuous flow oxygen system?

A

When the line valve is turned on, oxygen will flow continuously from the charged cylinder through a highpressure line to the pressure-reducing valve, which reduces the pressure to that required at the mask outlets. A calibrated orifice in the outlets will control the amount of oxygen delivered to the mask.

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15
Q

What must be done if an oxygen system has been depleted and not recharged within two hours?

A

It must be purged with dry nitrogen or dry air and oxygen.

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16
Q

How are high and low pressure oxygen cylinders identified?

A

High pressure (1800-1850 psi) oxygen cylinders are green in color and have the words “AVIATORS BREATHING OXYGEN” stenciled lengthwise in white, one-inch letters. All low-pressure (400-425 psi) oxygen cylinders are painted light yellow.