instrument landing system localizer
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instrument landing system localizer[′in·strə·mənt ¦lan·diŋ ‚sis·təm ‚lō·kə‚liz·ər]
System of horizontal guidance embodied in the instrument landing system which indicates the horizontal deviation of the aircraft from its optimum path of descent along the axis of the runway.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.