Unless otherwise authorized or required by ATC, no person may operate an aircraft at or below 2,500' AGL within 4 NM of the primary airport of a Class D airspace area at an indicated airspeed of more than 200 knots (230 mph)
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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.
(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.).
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.
Class D airspace: No transponder is required unless otherwise specified by ATC (Pilots only require two-way radio communication in this class of airspace).
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.
Class D airspace includes the smallest airports in the United States with an operational control tower. Although it is required to request and receive permission from the FAA, it is typically easier to do than most airspaces due to the small number of manned aircraft in the area.
- All aircraft operating in D class will squawk 3000 unless a discrete code is assigned. - Inbound IFR aircraft will report visual to ATC, even if the conditions are CAVOK. - No departure reports for VFR aircraft if departing into G class air space, only if they are departing into adjacent C or D airspace.
Introduction: Class Delta (also referred to as Class D) Airspace areas established around airports that have an Air Traffic Control Tower but do not provide radar services. Containing an Air Traffic Control Tower, Class D airspace areas provide services to pilots.
At some airports that have part-time control towers, the Class D surface airspace becomes a Class E Surface Area during the hours the tower is closed. At other airports, the Class D airspace becomes Class G (uncontrolled) airspace.