Medium Transport; Low Wing; 2 Turbojet Eng
Flight Crew Air Transport Pilot (ATP)
Confusion; Time Pressure; Situational Awareness; Communication Breakdown
ATC Issue All Types; Deviation - Speed All Types; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued Advisory / Alert; Flight Crew Became Reoriented; Flight Crew Took Evasive Action
Airspace Structure; Procedure; Human Factors
Approach told us to descend [at a] good rate down to 6;000 feet continued by a descent to 4;000 feet. While descending approach notified us that we had left the class Bravo and we immediately realized we were doing 250 below the class Bravo shelf.Doing 250 knots in the Class B; complying with an ATC clearance and descending at our best rate quickly put us below the Class B momentarily before the next lower shelf.Better awareness of this type of scenario happening. Now that I have seen how this can play out.
An air carrier on arrival to MSP was given an expedited clearance to 6;000 feet followed by clearance to maintain 4;000 feet. The flight descended out of MSP Class B at 250 KTS.