GA instructor with a student pilot reported they flew into Class B airspace without a clearance.

Report 1 | Narrative: Student pilot climbed to 4;500 feet where Class B started at 4;000 feet. Instructor did not catch the error in time and airspace was busted. The instructor had [the] student pilot descend in altitude immediately once she realized airspace was busted.Fatigue and stress were involved with student pilot. It was the last flight before the student's checkride and he was not prepared and frustrated. Instructor did not pick up on the student busting the airspace until after the airspace was busted.Instructor and student talked about this error and reviewed airspace after the flight.

This was the student's first flight under the Philadelphia Class Bravo and they are now more knowledgeable of the precautions of busting airspace. Instructor also learned from this error and knows to not let it happen again.

Report 1 | Synopsis: GA instructor with a student pilot reported they flew into Class B airspace without a clearance.