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2 Answers

Ground speed is True Airspeed corrected for?

Asked by: 3618 views General Aviation

is it ....
a)Position error 

b)Density altitude 



i dont understand it ? its one of my exam questiosn but i dont get it?

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2 Answers

  1. Lucas on May 21, 2012

    c) Wind
    Indicated is the one indicated by the instrument and is the one you use when ATC assigns you, for example 100kt
    Calibrated is indicated corrected for position error of the pitot tube.
    Equivalent is calibrated corrected for compressibility error (It really only concerns you if you fly over 200 kt, so don’t worry).
    True airspeed is equivalent corrected for temperature (and this is the speed at which the airplane flies through the air).
    And finally Ground speed is true corrected for wind (the speed the aircraft has across the ground).
    For information on this and many other test questions check out http://www.passfaaexams.com

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  2. Derek Schwalenberg on May 21, 2012

    TRUE airspeed is your actual speed relative to the air. The air is always moving. If you are standing fixed to the ground you feel that as wind. If you are in an airplane you will always be moving relative to the air. Imagine a balloon with no propulsion. Its airspeed always reads zero. Its groundspeed is the same as the wind speed. If its a 10kt wind than the balloon travels at 10kts. With an airplane you can fly into the wind, or away from it, parallel, etc.. We always land into the wind because it makes our groundspeed the lower for the same airspeed, reducing the chance of bouncing and/or wear on the landing gear system. If we are cruising, however, we might go to higher altitude if we have a tailwind to take advantage of the (usually) higher winds aloft so our groundspeed is even higher than our airspeed.

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