Can you fly over Class B airspace without a transponder?

Radio Procedures for Class B Airspace Unlike Class C airspace, a simple acknowledgement by ATC is not sufficient for you to enter Class B airspace. You must also receive clearance and a unique transponder squawk code to enter.



Technically, no—you cannot fly "over" or through Class B airspace without a functioning Mode C or Mode S transponder (and ADS-B Out) unless you have received specific, prior authorization from Air Traffic Control (ATC). Under FAA regulations (14 CFR 91.215), a transponder with altitude-reporting capability is required within the "Mode C Veil," which is a 30-nautical-mile radius extending from the surface to 10,000 feet MSL around the nation's busiest airports. Even if you are flying above the ceiling of the Class B (which is usually 10,000 feet), you are still within the lateral boundaries where ADS-B and transponders are mandatory. The only exception for flying without this equipment is if the aircraft was originally certificated without an electrical system (like certain vintage Piper Cubs or gliders), and even then, they are generally restricted from entering the Mode C Veil or Class B airspace itself. If your transponder fails in flight, you must immediately notify ATC, and they may, at their discretion, allow you to continue to your destination, but you cannot legally plan a flight through or over these areas without the required equipment.

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If requested by ATC, pilots are allowed to turn off the transponder.

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From the 1940s to the early 1960s, ATC only had primary radar available. Over half a century later, when an aircraft's transponder fails, modern radar controllers are trained to use some “back to basics” primary radar techniques to work around the problem and identify aircraft.

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Violating prohibited airspace established for national security purposes may result in military interception and/or the possibility of an attack upon the violating aircraft, or if this is avoided then large fines and jail time are often incurred.

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Two-way radio communications and operational transponder are normally required for operations within Class C airspace, but operations without radio communications or transponder can be conducted by LOA, facility directive, or special arrangement with Class C airspace controlling facility.

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Such operations shall comply with paragraph (a) of this section. (c) No person may operate an aircraft in the airspace underlying a Class B airspace area designated for an airport or in a VFR corridor designated through such a Class B airspace area, at an indicated airspeed of more than 200 knots (230 mph).

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Many class B airspaces diverge from this model to accommodate traffic patterns or local topological or other features. The upper limit of class B airspace is normally 10,000 feet (3,000 m) MSL. All aircraft entering class B airspace must obtain ATC clearance prior to entry and must be prepared for denial of clearance.

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You may fly without ADSB under the Class B or Class C shelf provided you remain outside of any Mode C veil. §91.225 tells you where you cannot fly. It says you cannot fly within the lateral boundaries of the Class B or C airspace or above the airspace.

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NATO aircraft operating around Ukraine turned off their transponders all at once leading up to this morning's Russian mobilization announcement. They did it all at once a couple hours before the announcement.

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Class A: All Airspace above 18,000 ft. Anybody flying here must receive a clearance from, be talking to, and be controlled by ATC. Class B: Airspace within approximately 30 miles and 10,000 feet of the ground around the busiest airports in the US.

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