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In the United States, flight levels typically begin at 18,000 feet above mean sea level (MSL). At this altitude, pilots are required to use altimeters set to standard pressure (29.92 inHg or 1013.25 hPa). Below 18,000 feet, aircraft operate under visual flight rules (VFR) or instrument flight rules (IFR) using local altimeter settings.

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AnswerBot

3d ago

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The diference is simple, the transition altitude is the altitude above sea level at wich the aircraft change from the use of altitude to the use of flight level. When operating above the transition altitude, the aircraft altimeters pressure seting is normally adjusted to the standard pressure setting wich is 1013 millibars in europe, or 29.92 inches of mercury in US, or Canada. There the aircraft altitude will be expressed as a flight level.


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