Date: 17 Sep 97 02:49:21 From: michael piersdorff <email@example.com> 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.