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20 Cards in this Set
- Front
- Back
Is there any special requirements as to the type of oxygen used in an aircraft system and if so what is it
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Only aviators breathing oxygen should be used
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Describe the operating principle of a continuous flow oxygen system
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1. High-pressure oxygen flows from the storage cylinder to a pressure regulator,
2. where it's pressure is reduced, 3. and then to the mask outlets whenever the system is turned on |
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Describe the operating principle of a pressure demand oxygen system
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Demand system allows 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 users lungs |
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What should be used to Purge an oxygen system of moisture
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1. Oxygen
2. dry air 3. dry nitrogen |
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What action must be taken when An oxygen system has been open to the atmosphere
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The system must be purged of any moisture
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Describe the safety precautions that should be observed when servicing oxygen systems
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1. Avoid all contact with petroleum-based oil or grease
2. don't smoke 3.keep everything very clean 4. service systems outdoors if at all possible 5. keep the caps on the bottles to protect the valves |
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What is a Roots blower
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A type of engine driven compressor
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Name two different types of independent cabin air compressors
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1. Positive displacement
2. Centrifugal |
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What is the source of pressurization air in most jet aircraft
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Engine bleed air
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What device provides the principal means of controlling cabin pressure
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The outflow valve
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What unit regulates the position of an outflow valve
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Cabin pressure controller
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Name several methods used on reciprocating engine aircraft for providing heated cabin air
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1. Exhaust shroud heat exchanger's
2. Combustion heaters 3. Electrical heaters |
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What is the function of the ventilating air in a combustion heater
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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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What are the sources of ventilating air in a combustion heater
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1. Ram air in flight
2. A blower on the ground 3. Possibly a compressor if the airplane is pressurized |
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Name the basic components of an air cycle cooling system
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1. The compressor and expansion turbine
2. Heat exchanger's 3. Various valves |
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Describe the basic operating principles that allow an air cycle system to produce cool air
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1. Hot engine bleed air is cooled in the primary heat exchanger, compressed, then cooled again in the secondary heat exchanger.
2. That air is expanded across the turbine where energy is extracted and the pressure is reduced. 3. This produces a large temperature drop |
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Describe the basic operating principles of a water separator
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Cool moist air is swirled so that the water droplets are separated by centrifugal force, captured by a sock, and drained
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Name the principle components of a vapor cycle system
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1. A compressor
2. Condenser 3. Expansion valve 4. evaporator |
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In what significant way is a vapor cycle cooling system different from an air cycle system
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Vapor cycle systems use a refrigerant liquid usually Freon
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Why is oil added to the refrigerant in a vapor cycle air-conditioning system
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To lubricate the compressor
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