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outer fix[′au̇d·ər ′fiks]
A fix in the destination terminal area, other than the approach fix, to which aircraft are normally cleared by an air route traffic-control center or a terminal area traffic-control facility, and from which aircraft are cleared to the approach fix or final approach course.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved