What does FL mean

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When an approach controller says go to FL200 what does this mean?

[Kevinsoto1502]

It means either climb or descend to a certain flight level or altitude

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but what certain flight level is FL200?

[Aircraft19]

20,000ft MSL

[AR_AR]

Hi,

Please search before posting. You’ll get an answer much faster than waiting for someone to respond!

Thanks!

Flight Levels

This is a quick and easy tutorial: flight levels. I haven't seen a tutorial on this, made most of you know, but maybe some of you don't. Note: Flight levels start up use at 18,000ft. A flight level is expressed as a 3 digit number referring to "thousands" in feet. It always ends on a 0 or a 5, and when someone says "Descend/Climb and maintain FL110", they mean "Descend/Climb and maintain 11,000ft.". In ATC communications, "FLXXX" will mean "Flight Level (Number) (Number) (Number). Here's a…

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Oh ok Thanks