Environmental/Waste Water Oral Flashcards
What are two main gasses that make up our atmosphere?
Nitrogen and Oxygen.
Why are the cabins of most turbine-powered aircraft pressurized?
If the cabin was not pressurized, supplemental oxygen would be needed for occupants on board because of the high altitude.
Where does the pressurizing air come from on most turbine-powered aircraft?
Engine compressor bleed air
Where does the pressurizing air come from on most of the smaller reciprocating-engine powered aircraft?
Engine turbocharger.
What determines the amount of pressurization that an aircraft can use?
Aircraft cabin structural strength.
How is cabin pressure controlled in a pressurized aircraft?
More pressure than is needed is pumped into the aircraft cabin, and the pressure controller modulates the outflow valve to maintain the correct pressure in the cabin
What is meant by the isobaric mode of cabin pressurization?
The isobaric mode of cabin pressurization is the mode that keeps the cabin altitude constant as the aircraft changes its flight altitude.
What is meant by the constant differential mode of cabin pressurization?
The mode that holds the pressure inside the cabin a constant amount above the outside air pressure after the pressure in the aircraft cabin reaches the maximum value that is allowed
What is the function of the cabin outflow valve on a pressurized aircraft?
The cabin outflow valve, which is controlled by the pressure controller, maintains the correct amount of pressure inside the cabin.
What is the function of the cabin pressure safety valve on a pressurized aircraft?
The cabin pressure safety valve prevents cabin pressure from exceeding the maximum allowable differential pressure.
Why must pressurized aircraft have a negative pressure relief valve?
The structure of an aircraft cabin is not designed to tolerate the inside pressure being lower than the outside pressure
What keeps the cabin of a pressurized aircraft from being pressurized when the aircraft is on the ground?
A squat switch on the landing gear holds the safety valve open when the aircraft is on the ground.
What are two types of air conditioning systems that may be installed on an aircraft?
Air-cycle systems and vapor-cycle systems.
Where does the warm air come from that is used to heat the cabin of a large jet transport aircraft?
Warm engine compressor bleed air is used.
Where does the warm air come from that is used to heat the cabin of most small single engine reciprocating-engine-powered aircraft?
From a shroud around the engine muffler.