How are Class D airspaces depicted on maps?

This category of airspace always begins at ground level. It is indicated on charts with a dashed blue line. The upper limit of Class D airspace is relayed in increments of 100 feet above sea level and is displayed in a dashed blue box. For example, an elevation of 2,500 feet above sea level would read as 25 MSL.



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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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4. Light Blue = Class D controlled airspace. Class D airspace is generally airspace from the surface to 2,500 feet above the airport elevation (charted in MSL) surrounding those airports that have an operational control tower.

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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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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.

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Since Class D is controlled airspace all the way to the surface, you can't fly VFR when the ceiling (a broken or overcast cloud layer) is less than 1000' AGL (FAR 91.155 (c)), or when the visibility is less than 3 SM.

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- 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.

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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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(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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Class G airspace is most easily found on a sectional map when a fading, thick blue line appears. This line shows enroute Class E airspace starting at 1,200 ft AGL on the soft side of the boundary.

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Air traffic control units use the term squawk when they are assigning an aircraft a transponder code, e.g., Squawk 7421. Squawk thus can be said to mean select transponder code or squawking xxxx to mean I have selected transponder code xxxx.

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Each person must establish two-way radio communications with the ATC facility (including foreign ATC in the case of foreign airspace designated in the United States) providing air traffic services prior to entering that airspace and thereafter maintain those communications while within that airspace.

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