What are the Class C airspace rules in the UK?

Class C. Class C airspace in the UK extends from Flight Level (FL) 195 (19,500 feet) to FL 600 (60,000 feet). Both IFR and Visual Flight Rules (VFR) flying is permitted in this airspace but pilots require clearance to enter and must comply with ATC instructions.



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Like most controlled airspace, ALL pilots must notify and receive approval from the FAA to fly in Class C airspace. Pilots must also follow the necessary procedure to receive permission. Approval cannot be granted by control towers individually; the request must be sent using one of two methods.

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The purpose of Class C airspace is to enhance aviation safety in the terminal area and to decrease the risk of midair collisions by providing traffic separation service.

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Class C airspace is used around airports with a moderate traffic level. Class D is used for smaller airports that have a control tower. The U.S. uses a modified version of the ICAO class C and D airspace, where only radio contact with ATC rather than an ATC clearance is required for VFR operations.

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§ 91.117 Aircraft speed. (b) Unless otherwise authorized or required by ATC, no person may operate an aircraft at or below 2,500 feet above the surface within 4 nautical miles of the primary airport of a Class C or Class D airspace area at an indicated airspeed of more than 200 knots (230 mph.).

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Aircraft not complying with the requirements may be denied access to this airspace. As described in 14 CFR 91.225, ADS-B Out performance is required to operate in: Class A, B, and C airspace.

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If you are receiving flight following, you are automatically cleared to enter the outer ring of a TFR and to enter Class C or D airspace. However, there is one circumstance that flight following will not protect you from, and that is flying into Class B airspace.

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The physical dimensions of the Class C airspace will normally be a 10 NM radius capped at 4,000 feet above the primary airport elevation. This airspace must extend no lower than 1,200 feet above the surface, except that an inner core with a 5 NM radius must extend down to the surface.

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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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To enter you need the control clearance and it is the control that tells each aircraft what he has to do… When a control tower only operates part time, the airspace will be designated Class C or D during the times the tower is operating, and Class E or G when the tower is closed.

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A Mode C transponder gives air traffic control (ATC) your altitude and an identification code. Specifically, a Mode C transponder is required if you wish to operate in Class A, B, or C airspace, at an altitude of over 10,000' MSL, or within a 30-nautical mile radius of the primary airport in Class B airspace.

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No person may operate an aircraft at an indicated airspeed of more than 200 knots (230 mph) at or below 2,500 feet above the surface, within 4 nautical miles of the primary Class C or Class D airport.

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In the 1900s, Hungarian physicist Theodore von Kármán determined the boundary to be around 50 miles up, or roughly 80 kilometers above sea level. Today, though, the Kármán line is set at what NOAA calls “an imaginary boundary” that's 62 miles up, or roughly a hundred kilometers above sea level.

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The FAA requires that all aircraft obtain ATC approval prior to entering Class D airspace. Approval is given by the ATC facility that provides ATC services for the designated airspace. This is usually the local tower at a controlled airport.

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