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In aviation and aviation meteorology, a flight level (FL) is an aircraft's altitude at standard air pressure, expressed in hundreds of feet.
17 kwi 2015 · In other words, if you're on a North or East course (360 - 179), then use Odd thousands. By elimination, if you're on a South or West course (180 - 359), then use Even thousands.
25 sty 2024 · Let’s take a look at what flight levels are, the significance of transition altitude and transition level, and why these components are essential for maintaining safe skies. How do aircraft measure altitude?
Flight level and standard pressure. A Flight Level (FL) is the vertical distance of an aircraft above the ISOBARIC SURFACE of 1013.25hPa (hecto Pascal) or 29.92 in Hg (inches of Mercury). An ISOBARIC SURFACE is the invisible landscape that connects all points with the same atmospheric pressure.
Strictly speaking a flight level is an indication of pressure, not of altitude. Only above the transition level (which depends on the local QNH but is typically 4000 feet above sea level) are flight levels used to indicate altitude; below the transition level feet are used.
EXAMPLE: The minimum safe altitude of a route is 19,000' MSL and the altimeter setting is reported between 29.92 and 29.42 inches of mercury, the lowest usable flight level will be 195, which is the flight level equivalent of 19,500 feet MSL (minimum altitude plus 500 feet)
To avoid mid-air collisions, aircraft fly at predefined altitudes known as flight levels. These flight levels are dependent on the atmospheric pressure and vary according to the weather conditions.
