What is the percentage of nitrogen and oxygen in earth’s atmosphere?
Nitrogen 78%
Oxygen 21%
What is nitrogen?
An insert gas that is not used directly by man for life processes
At sea level what psi is oxygen pressure in the lungs?
~3psi
What is demand-flow/ pressure-demand systems?
When oxygen is delivered only as the user inhales or on demand
What is the function of a condenser?
Transfer heat from the Freon gas to ambient air
What does a subcooler do?
Cool the refrigerant after it leaves the receiver. Doing this prevents premature vaporization
What prevents the sudden loss of pressurization in the event there is a loss of the pressurization source?
Delivery air duct check valve
What is the atmospheric pressure at sea level?
14.7psi
What is cabin differential pressure?
Cabin pressure - ambient pressure
What is cabin rate of climb?
The rate of change in air pressure inside the cabin, expressed in feet per minute (fpm) of cabin altitude change
What must a cabin pressurization system do?
Be capable of maintaining a cabin pressure altitude of approximately 8,000 feet or lower regardless of the cruising altitude of the aircraft
True or false. A supercharger is mechanically driven by the engine
True
What is a pack valve?
Valve that regulates bleed air from the pneumatic manifold into the air cycle air conditioning system
What acts as the reservoir of the vapor cycle system?
Receiver Dryer
on ground what is ventilating air from a combustion heater used for?
Carries heat to the places where needed
What component in a combustion heater controls the heat that is produced by cycling the fuel on and off?
Combustion chamber
Where does the first stage of cooling in an air-cycle air conditioning ystem occur?
Primary heat exchanger
