What happens if you enter Class B airspace?

Once you are in the air, you must maintain communications with ATC while you are within Class B airspace. If you are taking off from a nontowered satellite airport within Class B airspace, establish two-way radio communications and get a squawk code from ATC as soon as possible after departure.



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Flights. Aircraft within Class B airspace are required to operate in accordance with current IFR procedures. A clearance for a visual approach to a primary airport is not authorization for turbine- powered airplanes to operate below the designated floors of the Class B airspace.

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VFR aircraft must obtain an ATC clearance to operate in Class B airspace.

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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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To enter Class B airspace, all aircraft must meet the following requirements:
  • ATC clearance required to enter.
  • Establish and maintain two-way communication prior to entering and while in airspace.
  • Mode C transponder (within 30 nm, up to 10,000 feet msl)
  • Student pilot operations restricted.


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Controlled and uncontrolled airspaces are the ones you will spend most of your time flying within as a pilot. Controlled airspace consists of five tiers beginning with most restrictive to least restrictive: Class Alpha (A), Class Bravo (B), Class Charlie (C), Class Delta (D), and Class Echo (E).

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Once they've identified you, they'll tell you that you're cleared into the Class Bravo airspace. Those are the key words, and you need to hear them before you enter the airspace. If ATC tells you to 'standby. ' or anything similar, you need to stay out of the airspace until you are cleared into it.

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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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You must receive official clearance. Also, pilots must hold a minimum of a private pilot certification to enter Class B airspace. Sport pilots, recreational pilots, and student pilots are not authorized to operate in Class B airspace.

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However, if you wish to operate in class A, B, or C airspace, or at an altitude of over 10,000' MSL, or within a 30 nautical mile radius of the primary airport in class B airspace, you will need a transponder and altitude encoder (commonly referred to as mode C).

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Class B airspace locations must include at least one primary airport around which the Class B airspace area is designated. General Design. There is no standard Class B design. Instead, the size and shape of the Class B airspace area will vary depending upon location-specific ATC operational and safety requirements.

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Consequences. Taking off without ATC clearance may lead to: Runway Incursion - The aircraft may have been cleared only to the runway holding point. Also, at relatively complex aerodromes, taking off may mean crossing other runways.

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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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The upper limit of the airspace should not exceed 10,000 feet MSL. However, high airport field elevation, adjacent high terrain, or operational factors may warrant a ceiling above 10,000 feet MSL.

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Class B Airspace, indicated by a solid blue line. Class B airspace is shown with a solid blue line around major airports in circles radiating outward.

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If you fly IFR in Class B airspace, your aircraft must have an operating VOR or TACANreceiver. VFR aircraft are exempt from this requirement, so if a controller tells you totrack to or from a VOR, and you don't have a working VOR receiver, you can replyunable, and the controller will give you a heading to fly.

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The airspace around the busiest US airports is classified as ICAO Class B, and the primary airport (one or more) for which this airspace is designated is called Class B airport. As of January 2023, there are 37 Class B airports in the United States.

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