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27 Cards in this Set
- Front
- Back
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What are the two main gases that make up our atmosphere? |
Oxygen and Nitrogen. |
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Why are the cabins of most turbine-powered aircraft pressurized? |
because the altitudes they fly at would require supplemental oxygen if the cabin weren't pressurized. |
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Where does the pressurizing air come from on most turbine-powered aircraft? |
From bleed air from one of the engine compressors. |
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Where does the pressurizing air come from on most of the smaller reciprocating-engine-powered aircraft? |
From the turbocharger. |
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What determines the amount of pressurization that an aircraft can use? |
The structural strength of the cabin. |
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How is cabin pressure controlled in a pressurized aircraft? |
By varying the amount the outflow valve is opened with a pressurization controller. |
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What is meant by the isobaric mode of cabin pressurization? |
The mode that keeps cabin pressure constant as the aircraft changes altitude. |
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What is meant by the constant differential mode of cabin pressurization? |
The mode that holds cabin pressure a constant amount above the ambient pressure. |
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What is the function of the cabin outflow valve on a pressurized aircraft? |
to maintain the correct pressure in the cabin. |
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What is the function of the cabin pressure safety valve on a pressurized aircraft? |
to prevent the cabin from exceeding the max allowable differential pressure. |
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Why must pressurized aircraft have a negative pressure relief valve? |
because the aircraft structure isn't designed to have a cabin pressure that is lower than ambient. |
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What keeps the cabin of a pressurized aircraft from being pressurized when the aircraft is on the ground? |
A squat switch holds the safety valve open. |
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What are two types of air conditioning systems that may be installed on an aircraft? |
Air or vapor cycle systems. |
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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 |
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Where does the warm air used to heat the cabin of most small reciprocating-engine-powered aircraft come from? |
From a shroud around the engine exhaust muffler. |
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Where does the fuel come from that is used in an aircraft combustion heater? |
from the aircraft fuel tanks. |
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What happens to a combustion heater if the flow of ventilating air is restricted? |
the fuel to the heater will be cut off by a limit switch at a preset temperature. |
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How is the heat removed from an aircraft cabin with a vapor-cycle airconditioning system? |
it is absorbed by the refrigerant in the evaporator and released overboard in the condenser. |
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What produces the cool air in a vapor-cycle air conditioning system? |
by moving air over the evaporator to extract the heat. |
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Why must air-cycle air conditioning systems incorporate a water separator? |
To separate the moisture from the cold air as it leaves the expansion tube for the cabin. |
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What is used as the refrigerant in a vapor-cycle air conditioning system? |
A freon-type liquid refrigerant known as refrigerant 12 or R134-a. |
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What are three ways supplemental oxygen can be carried in aircraft? |
as a high pressure gas, in liquid form, or in the form of a solid chemical candle. |
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What kind of gaseous oxygen must be used to service an aircraft oxygen system? |
only "Aviator's Breathing Oxygen" |
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What is used to check an oxygen system for leaks? |
A special leak detector fluid. |
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What is a continuous-flow oxygen system? |
A system that continuously flows a regulated amount of oxygen. |
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What is a pressure-demand oxygen system? |
A system that delivers oxygen only when the wearer of the mask inhales. |
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What identification must be stamped on an oxygen bottle that is carried in an aircraft? |
DOT 3AA or DOT 3HT, the date of manufacture, and the date of all of the hydrostatic tests. |
