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| Apt Elev || <u>A</u>ir<u>p</u>or<u>t</u> <u>Elev</u>ation || the MSL of a central point of an airport | | Apt Elev || <u>A</u>ir<u>p</u>or<u>t</u> <u>Elev</u>ation || the MSL of a central point of an airport | ||
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| APU || [http://en.wikipedia.org/wiki/Auxiliary_power_unit Auxiliary power unit] || Primary purpose is to provide power to start the main engines | |||
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| ASOS || [http://en.wikipedia.org/wiki/Automated_airport_weather_station <u>A</u>utomated <u>S</u>urface <u>O</u>bservation <u>S</u>ystem] || measures and broadcasts surface wheather info automatically | | ASOS || [http://en.wikipedia.org/wiki/Automated_airport_weather_station <u>A</u>utomated <u>S</u>urface <u>O</u>bservation <u>S</u>ystem] || measures and broadcasts surface wheather info automatically |
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