We'd like to use analytics cookies to understand which symbols people look up, so we know what to research next. They are not used for advertising and we set none of them unless you say yes. What we store.
A three-figure altitude flown on a standard pressure setting.
Also known as: FL notation, Pressure altitude
A flight level is an altitude flown with the altimeter set to a standard pressure rather than to the local one, so that all aircraft at the same level are separated regardless of the weather. It is not a height above the ground and can differ from one by hundreds of feet.
States a pressure altitude flown with the altimeter set to the standard datum, written as FL and three figures.
Contexts: Navigation
Is not a height above the ground or above sea level, and the difference from true altitude varies with the weather.
Contexts: Navigation
Exists so that aircraft at the same level are vertically separated from one another even when every altimeter is reading incorrectly by the same amount.
Contexts: Navigation
Two capital letters followed by three numerals, written without a space in a clearance or a chart note.