An ATC service is provided according to the particular circumstances and class of airspace, for the purpose of preventing collisions between aircraft in the air, assisting in preventing collisions between aircraft moving on the apron and the manoeuvring area, assisting in preventing collisions between aircraft and obstructions on the manoeuvring area and expediting and maintaining an orderly flow of air traffic. ATC Services are subject to the Single European Sky Regulations and EASA related Regulations which together include Certification, Designation and Interoperability. For reference purposes, the Air Traffic Services Outside Controlled Airspace (ATSOCAS) related FIS document, CAP 774 UK Flight Information Services, is noted here.
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