It's shorthand for above sea level. A term generally used to define how the top on Earth is to a certain position.
00:46, 15 January 2013
Designed by British architect Dame Zaha Hadid, the Beijing ...
A highly accurate tachometer that shines a laser beam on ...
Front edge of wing, rotor, tail or other aerofoil.
Gotham Air is a New York based company that offers ...
Emirates is an airline based in Dubai, United Arab ...
The engine intake is a part of the aircraft engine in which ...
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