Large Transport; Low Wing; 2 Turbojet Eng
Flight Crew Air Transport Pilot (ATP)
Confusion; Situational Awareness; Distraction
ATC Issue All Types; Deviation - Speed All Types; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued Advisory / Alert
Airspace Structure; Chart Or Publication; Procedure
I was Pilot Monitoring giving 3rd leg of IOE to FO PF. At approximately 19NM from RWY 06L direct DUPAY at 6000' we were cleared; 'CROSS DUPAY AT OR ABOVE 3000' CLEARED FOR ILS 6L.' PF selected LVL CH and speedbrakes; and began descent to 3000'. As we leveled off at 3000' just outside of DUPAY; ATC notified us 'you have departed class B airspace and are reentering; now.' Our speed was approximately 230kts.We were unaware that we would be below the class B 15 miles from the RWY at 3000'.Closer study of the Class B chart would require 200kts below 4000' outside of DUPAY. Or Ride the GS down to DUPAY.
An air carrier 19NM from CLE Runway 6L was 'cleared to cross DUPAY at or above 3;000'; cleared for ILS 6L' and descended out of Class B airspace prior to 15DME at 230Kts.