Uncontrolled airspace

In aviation, uncontrolled airspace is airspace in which an air traffic control (ATC) service is not deemed necessary or cannot be provided for practical reasons. It is the opposite of controlled airspace. It is that portion of the airspace that has not been designated as Control Area, Control Zone, Terminal Control Area or Transition Area.

According to the airspace classes set by the International Civil Aviation Organization (ICAO), the uncontrolled classes of airspace are class F and G. Uncontrolled airspace does not require a clearance to enter.

ATC does not exercise any executive authority in uncontrolled airspace, but may provide basic information services to aircraft in radio contact. Aircraft entering controlled airspace from uncontrolled airspace will need a clearance from the relevant ATC unit in order to do so. Aircraft in uncontrolled airspace will not receive separation from other flights but may receive an information service, if available and practical.

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