Chapter 14 - Cabin Atmosphere Control System - Oral Questions Flashcards

1
Q

Is there any special requirement as to the type of oxygen used in an aircraft system, and if so, what is it?

A

Only aviators breathing oxygen should be used

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2
Q

Describe the operating principle of a continuous-flow oxygen system

A

High-pressure Oxygen flows from the storage cylinder to a pressure regulator where its pressure is reduced and then to the mask outlets when the system is turned on

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3
Q

Describe the operating principle of a pressure-demand oxygen system

A

Demand systems allow oxygen to flow from the cylinder to the regulator and then to the mask only when the user inhales. Pressure-demand systems provide O2 to the user at higher than atmospheric pressure when used at extremely high altitudes, forcing oxygen into users lungs

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4
Q

What should be used to purge an oxygen system of moisture?

A

Oxygen, dry air, or nitrogen

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5
Q

What action must be taken when an oxygen system has been open to the atmosphere?

A

The system must be purged of any moisture

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6
Q

Describe the safety precautions that should be observed when servicing oxygen systems

A

Avoid all contact with petroleum-based oil or grease,

don’t smoke,

keep everything very clean,

service systems outdoors if possible,

keep caps on bottles to protect valves

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7
Q

What is a Roots blower?

A

A type of engine driven compressor

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8
Q

Name two different types of independent cabin air compressors

A

Positive displacement and centrifugal

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9
Q

What is the source of pressurization air in most jet aircraft?

A

Engine bleed air

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10
Q

What device provides the principle means of controlling cabin pressure?

A

The outflow valve

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11
Q

What unit regulates the position of an outflow valve

A

The cabin pressure controller

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12
Q

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

A

Exhaust shroud heat exchangers,

combustion heaters,

electric heaters

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13
Q

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

A

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

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14
Q

What are the sources of ventilating air in a combustion heater?

A

Ram air in flight,

a blower on the ground, or

possibly a compressor if the airplane is pressurized

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15
Q

Name the basic components of an air cycle cooling system

A

Compressor,

heat exchangers,

expansion turbine,

valves

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16
Q

Describe the basic operation of an air-cycle system

A

Hot engine bleed air is cooled in the primary heat exchanger, compressed, then cooled again in the secondary heat exchanger. This air is expanded across the expansion turbine, where energy is extracted and pressure reduced- this creates a drop in temperature.

17
Q

Describe the basic operating principles of a water separator

A

Cool, moist air is swirled so that water droplets are separated by centrifugal force, captured by a sock, and drained

18
Q

Name the principle components of a vapor cycle system

A

A compressor, condenser, expansion valve, and an evaporator

19
Q

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

A

Vapor cycle uses a refrigerant liquid, usually Freon

20
Q

Why is oil added to the refrigerant in a vapor cycle system?

A

To lubricate the compressor