Operational Error

(See also Operational Deviation, Pilot Deviation, Runway Incursion, Vehicle/Pedestrian Deviation) An occurrence attributable to an element of the air traffic control system which: 1) results in less than the applicable separation minima between two or more aircraft, or between an aircraft and terrain or obstacles and obstructions as required by Handbook 7110.65 and supplemental instructions. Obstacles include vehicles/equipment on runways; 2) aircraft lands or departs on a runway closed to aircraft operations after receiving air traffic authorization. (FAA3)