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negative g[′neg·əd·iv ′jē]
In designating the direction of acceleration on a body, the opposite of positive g ; for example, the effect of flying an outside loop in the upright seated position.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The applied vertical acceleration on the aircraft is in the reverse direction to that in the normal sense. This condition arises when the control column is pushed forward as in pushovers from a steep climb or while carrying out of outside loops (bunts). An aircraft is designed to withstand much lower values of negative g than it is for positive g. The application of negative g is prohibited in most commercial aircraft except when it is absolutely unavoidable.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved