What is the maximum airspeed restriction inside Class B airspace on the Standard Instrument Departure (SID)?

In Class B airspace, the maximum airspeed restriction during a Standard Instrument Departure (SID) is set to 250 knots. This limit is designed to ensure safety and manage the operation of aircraft in busy airspace near major airports. Class B airspace typically encompasses the airspace surrounding the busiest airports, where the potential for high-density traffic demands strict speed regulations.

The 250-knot limit helps to maintain separation between aircraft, reduce the likelihood of wake turbulence encounters, and improve the overall flow of air traffic, which can be complex due to multiple flight paths converging and departing from the airport. Keeping aircraft within this speed limit also enhances the effectiveness of air traffic control instructions and ensures a smoother transition for departing aircraft into en route phases of flight.

In essence, the imposition of a 250-knot maximum airspeed during SIDs within Class B airspace reflects both safety considerations and the operational complexities of navigating in and around busy airport environments.