FLIGHT LEVEL (FL) 

Woodye2023-02-10  306

FLIGHT LEVEL (FL) 

A level of constant atmospheric pressure related to a reference datum of 29.92 inches of mercury. Each is stated in three digits that represent hundreds of feet. For example, flight level 250 represents a barometric altimeter indication of 25,000 feet; flight level 255, an indication of 25,500 feet. 

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