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normal axis[′nȯr·məl ′ak·səs]
The vertical axis of an aircraft or missile.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
A straight line through the center of gravity, which is vertical when the airplane is in the rigging position. The aircraft yaws about this axis. Also called a vertical axis.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved