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air pocket

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air pocket

a localized region of low air density or a descending air current, causing an aircraft to suffer an abrupt decrease in height
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

air pocket

[′er ‚päk·ət]
(engineering)
An air-filled space that is normally occupied by a liquid. Also known as air trap.
(meteorology)
An expression used in the early days of aviation for a downdraft; such downdrafts were thought to be pockets in which there was insufficient air to support the plane.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

air pocket

An air-filled volume within a section of piping (or an apparatus) which is normally filled with liquid.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

air pocket

An area of reduced pressure in the air in which the aircraft looses height rapidly and creates an illusion of absence of air to support the aircraft. The resultant effect is rather unpleasant. An air pocket can also produce the reverse effect, but the experience is not as unpleasant.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
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