mountain effect[′mau̇nt·ən i‚fekt]
The effect of rough terrain on radio-wave propagation, causing reflections that produce errors in radio direction-finder indications.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
An error in a radio direction finder caused by radio waves being reflected from the surface of a mountain, which may cause a direction-finding needle to fluctuate or give erroneous readings. The error is predominant when an aircraft is flying over mountains.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved