off-mounted

off-mounted

An arrangement in which the secondary surveillance radar (SSR) aerial is not mounted on the primary radar but on its own turning gear. It is thus possible to either synchronize the rotation of the SSR aerial with that of the primary radar or to rotate it at some other predetermined rate.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
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Missing or off-mounted layers are said to lead to downtime and material waste.