height above touchdown

Also found in: Acronyms.

height above touchdown (HAT)

The decision height or minimum descent altitude above the highest runway elevation in the touchdown zone (i.e., the first 3000 ft of the runway). The HAT is published on instrument approach charts in conjunction with all straight-in minimums. Also referred to as the height above touchdown zone or the height above the touchdown zone elevation.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
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