Re: airpockets

Date:         17 Sep 97 02:49:21 
From:         michael piersdorff <piersdorff.michael@ic.gc.ca>
Organization: Industry Canada
References:   1
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The atmosphere is always in motion. We are most familiar with horizontal
components of that motion as wind at the surface.  At altitude, some of
that motion is vertical.  An "airpocket" is a vertical downgust,
opposite to what would be felt as a bump, which is a vertical upgust.

The downward moving air carries the aircraft down with it, giving a
downward acceleration which your stomach and ears sense as falling.
Since the aircraft usually rides through the downgust area in a few
seconds or less, and you are not as sensitive to the vertical up
acceleration which may accompany the down, you feel as if the aircraft
had hit a pothole or pocket in the air.