Where is the ceiling of Class D airspace shown?

Generally, Class D airspace extends from the surface to 2,500 feet above the airport field elevation. The vertical boundaries are marked with a bold blue number, surrounded by a bold blue dashed square. The number represents the ceiling of Class D airspace in hundreds of feel MSL.



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Class D areas should normally extend upward from the surface up to and including 2,500 feet AGL.

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Class D areas should normally extend upward from the surface up to and including 2,500 feet AGL. The altitude must be converted to MSL and rounded to the nearest 100 feet.

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Class D airspace is controlled and also has a control tower for the corresponding airport that will issue clearances to aircraft to taxi, takeoff, and land.

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(1) Unless required by the applicable distance-from-cloud criteria, each pilot operating a large or turbine-powered airplane must enter the traffic pattern at an altitude of at least 1,500 feet above the elevation of the airport and maintain at least 1,500 feet until further descent is required for a safe landing.

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Without ADS-B Out, you can fly in any airspace except the ADS-B rule airspace defined by FAR 91.225 (see above). Note that ADS-B is not required in Class D airspace, or under a Class B or Class C airspace shelf, unless it lies within a Mode C veil.

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The ceiling of this airspace, shown in blue, is 10,000' MSL and because nothing is depicted over it, we know Echo fills in the gap between 10,000' and 18,000' MSL where Alpha begins. Above Alpha again lies Echo.

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The main requirements for operating within Class D airspace are to have a functional two-way radio and to establish two-way communication with ATC prior to entering the airspace. Pilots must also meet all of the established weather minimums and obey speed regulations.

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Class D. IFR and VFR flights are permitted and all flights are provided with air traffic control service, IFR flights are separated from other IFR flights and receive traffic information in respect of VFR flights, VFR flights receive traffic information in respect of all other flights.

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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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Each person who operates an aircraft in a Class D airspace area must maintain two-way radio communications with the ATC facility having jurisdiction over that area. (1) If the aircraft radio fails in flight under IFR, the pilot must comply with § 91.185 of the part.

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Most commercial jetliners have a service (or certificated) ceiling of about 42,000 ft (12.8 km; 8.0 mi) and some business jets about 51,000 ft (15.5 km; 9.7 mi). Before its retirement, the Concorde supersonic transport (SST) routinely flew at 60,000 ft (18.3 km; 11.4 mi).

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