Airframe Chapter 14 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 aviator’s breathing oxygen should be used.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Describe the operating principles of a continuous flow oxygen system.

A

High pressure oxygen flows from the storage cylinder to a pressure regulator where it’s pressure is reduced and then to the mask outlet whenever the system is turned on.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Describe the operation 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 oxygen to the mask at higher than atmospheric pressure when used at extremely high altitudes, forcing oxygen into the user’s lungs.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

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

A

Oxygen, dry air, or dry nitrogen.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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 system outdoors if at all possible, and keep the caps on the bottles to protect the valves.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is a Roots blower?

A

A type of engine driven compressor.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Name two different types of independent cabin air compressors?

A

Positive displacement and centrifugal.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

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

A

Engine bleed air.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What device provides the principle means of controlling cabin pressure?

A

The outflow valve.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What unit regulates the position of an outflow valve?

A

The cabin pressure controller.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

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

A

Exhaust shroud heat exchangers, combustion heaters, and electric heaters.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

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

A

Ram air in flight, a blower on the ground and possibly a compressor if the airplane is pressurized.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Name the basic components of an air cycle cooling system.

A

The compressor and expansion turbine, heat exchangers, and various valves.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

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

A

Hot engine bleed air is cooled in the primary heat exchanger, compressed , then cooled again in the secondary heat exchanger, this is expanded across the turbine where energy is extracted and the pressure is reduced. It’s produces a large temperature drop

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 an air cycle system?

A

Vapor cycle systems use a refrigerant liquid, usually Freon.

20
Q

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

A

To lubricate the compressor.