Cabin Atmosphere Control Systems Flashcards
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 compressor
What is a roots blower?
An engine driven compressor
What is the function of ventilating air in a combustion heater?
It is the air that is warmed and sent into the cabin
What pressurization control unit will change the position of an outflow valve?
The cabin pressure controller
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?
Expansion Valve, Evaporator, Compressor, Condenser, and Dryer Receiver
How does a continuous flow oxygen system operate?
Oxygen flows from a charged cylinder through a high pressure line to a 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 atmosphere for 2 hours or more?
The system must be purged to remove moisture
