Cabin Atmosphere Flashcards
Two groups of independent cabin compressors?
Positive displacement and centrifugal 
What is the principal control of pressurization systems?
Outflow valve
Method used by some turbines?
Bleed air
What is a roots blower?
Engine driven compressor
What controller will change the position of outflow valve?
Cabin pressure controller
Methods of providing heat on recip. aircraft?
Gas combustion heater, electric, exhaust gas air to air heat exchanger
Function of ventilating air in a combustion heater?
More heat where needed
Sources of ventilating air and comb. heater?
Blower, ram air, cabin compressor
Components of air cycle coding system?
Expansion turbine, air to air beat exchange, various valves
What causes the temp drop in air cycle?
Air does work and undergoes a pressure and temperature drop
How does a water separator work?
Vanes swirl the air and the water is collected
Vapor cycle?
Freon cooling
Components of vapor cycle?
Evaporator, compressor, condenser, and expansion valves
How does continuous flow oxygen work?
Oxygen flows from a cylinder through a line to a reducing valve and to mash outlets
How does pressure demand systems work?
Oxygen flows from cylinder to PD regulator and each member adjust as needed
If system is open 2 or more hours?
Must be purged to remove moisture
Used to purge?
Dry nitrogen, air, or 02
Type of O2 used?
Aviators breathing oxygen (ABO)
Why is oil added to vapor cycle systems?
Provide lube for compressor
Safety handling 02?
Oil free tools, clothing, hands, eye protection
