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(ËreÉª dÉr) n. 1. a device or system for determining the presence and location of an object by measuring the direction and timing of radio waves. 2. a means of awareness; perception: lobbyists working under the media's radar.
(March 2008) In United States aviation, a terminal radar service area (TRSA) is a delimited airspace in which radar and air traffic control services are made available to pilots flying under instrument flight rules or (optionally) visual flight rules for the purposes of maintaining aircraft separation.