Class B airspace — Unrestricted at or above 10,000 feet msl, 250 kias below 10,000 feet msl. Beneath Class B or in VFR corridor through Class B — 200 kias. Procedure turn — 200 kias.
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Class B airspace surrounds the busiest airports from the surface to 10,000 feet MSL. The dimensions of Class B airspace vary depending on the needs of the airport. Class C airspace extends from the surface to 4,000 feet MSL.
Class B Airspace AltitudeIn some high-altitude airports like Denver, the Class B ceiling extends up to 12,000 feet MSL. Atlanta is another example of an irregular Class B airspace ceiling altitude. Due to the high volume of air traffic, the Class B ceiling in Atlanta reaches up to 12,500 feet MSL.
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.
An ATC clearance is required for all aircraft that receive separation services within the airspace. Even though you may be operating below the Bravo, you should use caution against operating too closely to the boundaries, especially where the floor of the Class B airspace is 3,000 feet or less above the surface.
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.
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).
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.
Class B. Generally, from surface to 10,000 feet mean sea level (MSL) including the airspace from portions of Class Bravo that extend beyond the Mode C Veil up to 10,000 feet MSL (e.g. LAX, LAS, PHX)
Most likely it means you are cleared to enter a shelf of the class bravo airspace when your aircraft is at or above 3500' ASL. Another interpretation is that you are cleared to enter a shelf of the class bravo with a floor at 3500', as listed on your charts.
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.
The 250 KIAS maximum airspeed below 10,000 feet MSL was a rule of flight that was introduced a number of years ago to address the bird strike hazard of modern high-speed aircraft.
Loss of Separation - If the take-off without clearance is not aborted, either because of lack of communication or due to the pilots non-compliance with the instruction (e.g. for safety reasons), there is a chance that the aircraft that has just taken off will come into close proximity with other traffic in the vicinity ...