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AIRFRAME 09

Cabin Atmosphere Control Systems

QuestionAnswer
What are the two groups of independent cabin compressors? Positive-displacement and centrifugal
What is the principal control of a pressurization system? An outflow valve
What method is used by some turbine-powered aircraft for pressurization? Bleed air from the turbine-engine compressors
What is a roots blower? An engine-driven compressor
What pressurization control unit will change the position of an outflow valve? The cabin pressure controller
What is the function of ventilating air in a combustion heater? It is the air that is warmed and sent into the cabin
What are sources of ventilating air in a combustion heater? A blower / fan or ram air
What components are used in an air-cycle cooling system? An expansion turbine, air-to-air heat exchanger, and various valves
What causes a temperature drop in air-cycle cooling system? The compressed air performs the work of turning a turbine, and it undergoes a pressure and temperature drop
How does a water separator remove moisture from the air? The moist air passes through vanes that swirl the air and the droplets are collected and drained
What is vapor-cycle cooling? A closed system in which a refrigerant is circulated through tubing and a variety of components to remove heat from the aircraft
What components are in a vapor-cycle cooling system? A receiver dryer, evaporator, compressor, condenser, and expansion valve
How does a continuous-flow oxygen system operate? Oxygen flows from a charged cylinder through a high-pressure line to reducing valve and to mask outlets
How does a basic pressure-demand oxygen system operate? Oxygen flows from a charged cylinder to a pressure-demand regulator, adjustable by each crewmember
What must be accomplished if an oxygen system has been open to the atmosphere for 2 hours or more? The system must be purged to remove moisture
What is used to purge oxygen lines of moisture? Dry nitrogen, dry air, or oxygen
What type of oxygen must be used in aircraft? Aviator's breathing oxygen
Why is oil added to a vapor-cycle freon system? To seal and lubricate the compressor
What safety precautions should be observed when servicing oxygen systems? Have grease free tools, clothing, and hands. No smoking or open flames within 50 feet; do not use adhesive tape of any kind
Created by: Chisum
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