Airframe Systems and Components (Cabin Atmosphere) Flashcards
What is the principal control element in a cabin pressurization system?
Cabin outflow valve.
what is the purpose of the negative pressure relief in the pressurization system?
Prevents accidentally obtaining a cabin altitude which is higher than the altitude of the aircraft.
What control changes the position of the outflow valve?
The pressurization controller.
What are the two groups of independent cabin compressors?
Positive displacement, and centrifugal compressors.
What method is used by turbine powered aircraft for pressurization?
Bleed air from the compressor.
What limits the degree of cabin pressurization?
By structural design of the fuselage, and by capacity of the superchargers to maintain a constant volume of air flow to the fuselage.
Where does the warm air for cabin heating come from in most small reciprocating engine aircraft?
From the shroud around the muffler.
what are three methods of supplying here to the conditioned air when the heat of compression is not sufficient for this purpose?
Combustion heaters, electric heaters, and exhaust gas air-to-air heat exchangers.
What is the function of ventilating air in a combustion heater?
carries the heat to where it needs to go
where does the fuel used in aircraft combustion heater come from?
Aircraft fuel tanks.
What controls the temperature in aircraft cabin that is heated with a combustion heater?
a thermostat
what are sources for ventilation air?
On the ground the blower is used. In-flight ram air inlets or cabin compressors on pressurized aircraft.
What are the components of an air cycle cooling system?
Expansion turbine, air to air heat exchanger, and various valves to control airflow through the system.
What causes a temperature drop in an air cycle cooling system?
As the compressed air passes through expansion turbine, they performed the work of turning the turbine and undergoes a pressure and temperature drop.
What are the components in a vapor cycle cooling system?
The compressor, condenser, receiver/dryer, expansion valve, and evaporator.
