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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? |
Nitrogen and oxygen |
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Why are the cabins of most turbine powered aircraft pressurized? |
Because these aircrafts fly an altitude that supplemental oxygen will be required for the occupants of the aircraft. |
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Where does the pressurizing air come from on most turbine powered aircraft? |
Engine compressor bleed air |
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Where does the pressurizing air come from on most of the smaller reciprocating engine powered aircraft? |
From the engine turbocharger |
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What determines the amount of pressurization that an aircraft can use? |
The structural strength of the aircraft cabin. |
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How is cabin pressure controlled in a pressurized aircraft? |
Through the opening of the outflow valve by the pressure controller to maintain the pressure in the cabin |
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What is meant by isobaric mode of a cabin pressurization? |
The altitude pressure within the cabin is kept constant despite the aircraft flight changing altitude |
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What is meant by the constant differential mode of cabin pressurization? |
The mode that holds the aircraft cabin pressure constant above the outside air pressure |
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What is the function of the cabin outflow valve on a pressure rest aircraft? |
It is regulated by the pressure control to maintains the correct amount of pressure inside the cabin |
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What is the function of the cabin pressure safety valve on a pressurized aircraft? |
Regulates cabin pressure from exceeding the maximum allowable differential pressure |
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Why must pressurized aircrafts have a negative pressure relief valve? |
Because most pressurized cabin systems are not designed to tolerate the inside pressure being lower than the outside pressure. |
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What keeps the cabin of the pressurized aircraft from being pressurized when the aircraft is on the ground? |
The squat switch on the landing gear that holds the safety valve open as long as the aircraft is on the ground |
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what are two types of air conditioning systems that may be installed on an aircraft? |
Air-cycle system or vapor-cycle system |
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Where does the warm air come from that is used to heat the cabin of large jet transport aircraft? |
From the engine compressor bleed air |
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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 |
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Where does the fuel come from that is used in an aircraft combustion heater |
From the fuel tanks of the aircraft |
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What happens to a combustion heater if the flow of ventilating air is restricted? |
The limit switch will shut off the fuel to the heater once a preset temperature value has been reached |
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How is heat removed from an aircraft cabin with a vapor cycle air conditioning system? |
It is absorbed by the refrigerant in the evaporator and carried outside the aircraft where it's giving up in the condenser |
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What produces the cool air in a vapor-cycle air conditioning system? |
The evaporator absorbs the heat in the warm air through the refrigerant and sends out cool air |
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Why must air-cycle air conditioning systems incorporate a water separator? |
Because the rapid cooling moisture in the air in the expansion turbine tends to create a fog when it condenses and needs to be separated from the air before it's released to the cabin |
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What is used as the refrigerant in vapor cycle air conditioning system? |
Freon type refrigerant 12 or 134a |
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What are three ways oxygen can be carried in an aircraft? |
Solid as chemical candles, liquid form and as high pressure gas |
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What kind of gaseous oxygen must be used to service an aircraft oxygen system? |
Only Aviators' breathing oxygen |
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What is used to check an oxygen system for leaks? |
Special leak detector liquid in the form of an oily soap |
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What is a continuous flow oxygen system? |
System that has continuous metered oxygen flow into the mask |
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What is a pressure-demand oxygen system? |
A System that supplies oxygen into the mask only when the wearer inhales, usually above a certain altitude in flight |
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What identification must be stamped on an oxygen bottle that is carried on an aircraft? |
DOT 3AA or DOT 3HT, the date of manufacture, and all the dates of the hydrostatic tests |
