Which airspace is not controlled?

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.



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Uncontrolled airspace or Class G airspace is the portion of the airspace that has not been designated as Class A, B, C, D, or E. It is therefore designated uncontrolled airspace. Class G airspace extends from the surface to the base of the overlying Class E airspace.

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Class G airspace is the only form of uncontrolled airspace in the United States. It isn't charted, and it exists wherever Class A, B, C, D or E doesn't. But to truly understand Class G airspace, it helps to understand Class E airspace first.

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A generic term that covers the different classification of airspace (Class A, Class B, Class C, Class D, and Class E airspace) and defined dimensions within which air traffic control service is provided to IFR flights and to VFR flights in accordance with the airspace classification.

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Class G airspace (uncontrolled) is that portion of airspace that has not been designated as Class A, Class B, Class C, Class D, or Class E airspace. Rules governing VFR flight have been adopted to assist the pilot in meeting the responsibility to see and avoid other aircraft.

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Class C: This is the controlled airspace above 7,500 feet and surrounding major airports. Both IFR and VFR flights are permitted and both require ATC clearance and separation service is to be provided by ATC. Class G: This airspace is uncontrolled.

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There are two categories of airspace or airspace areas: Regulatory (Class A, B, C, D, and E airspace areas, restricted and prohibited areas). Nonregulatory (military operations areas [MOA], warning areas, alert areas, controlled firing areas [CFA], and national security areas [NSA]).

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There are five different classes of controlled airspace: A, B, C, D, and E airspace. A pilot requires clearance from ATC prior to entering Class A and B airspace, and two-way ATC communications are required before flying into Class C or D airspace.

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For flights near airports in uncontrolled airspace that remain under 400' above the ground, prior authorization is not required. When flying in these areas, remote pilots and recreational flyers must be aware of and avoid traffic patterns and takeoff and landing areas.

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Controlled airspace is found around some airports and at certain altitudes where air traffic controllers are actively communicating with, directing, and separating all air traffic. Other airspace is considered uncontrolled in the sense that air traffic controllers are not directing air traffic within its limits.

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Special use airspace (SUA) consists of that airspace wherein activities must be confined because of their nature, or wherein limitations are imposed upon aircraft operations that are not a part of those activities, or both.

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Class B airspace surrounds the busiest airports from the surface to 10,000 feet MSL. The dimensions of Class B airspace vary depending on the needs of the airport. Class C airspace extends from the surface to 4,000 feet MSL.

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In short, the real purpose of Class F is to allow flights to remain IFR in uncontrolled environments. Since this is a sort of mix between Class E and Class G airspace, there is no Class F inside the United States.

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In the U.S., airspace is categorized as regulatory and non-regulatory. Within these categories exist: controlled (classes A, B, C, D, and E) and uncontrolled (class G) airspace, based on which air traffic control service is provided to IFR flights and some VFR flights.

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Class C Airspace (Mandatory Radar) A shelf area with an outer radius of 10 nautical miles surrounds the core area. It extends from 1200 feet AGL to 4000 feet AGL. The airspace is depicted on charts as 2 concentric magenta circles.

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