Medium Transport; Low Wing; 2 Turbojet Eng
Flight Crew Air Transport Pilot (ATP)
Workload; Time Pressure; Situational Awareness; Distraction; Confusion
Airspace Violation All Types; Deviation - Altitude Overshoot; Deviation - Altitude Crossing Restriction Not Met; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Took Evasive Action; Flight Crew Became Reoriented; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Returned To Clearance
Procedure; Human Factors; Chart Or Publication
Inbound on the visual approach; was given the Tiptoe visual.  Approximately over MENLO; was then given the Quiet Bridge.   While working to switch fixes in the FMS; we over shot the 90 degree turn to the airport by approximately 1 mile.  After correcting and descending; I noticed we descended 600 ft. below the class B protected airspace on the Charted Visual. of 1800ft.  Corrective action was immediately taken as well as a advisory from the tower also occurred.  After the corrective action; the aircraft was landed at SFO without further incident. My acceptance of the last minute change in approach should not have been taken.  I felt as being a visual approach; there risk for safety was low.  Also; focusing in changing the FMS from the pilot flying distracted him from keeping inside Class B.After contacting SFO Tower by phone; they indicated that the altitudes were not regulatory just an advisory that we were not protected out of the Class B airspace below 1;800' which is a VFR corridor.  The FO and I didn't immediately fill out a report until later upon discussing the incident further.  It was decided to bring the safety aspect of taking a change at the last minute must be completed by the PM instead of the PF so as to fly the aircraft and not fixate on the FMS.  Also possibly not accept the clearance at the last minute.
The reporter stated that NORCAL initially said expect the QUIET BRIDGE Visual but very near MENLO made the visual change. Neither NORCAL and SFO Tower made comments about their procedure; although at they were turning back to the 095° SFO did comment 'You're turning back; right?' which they already were doing.
[Report narrative contained no additional information.]
NCT issued an air carrier crew the SFO Quiet Bridge Visual near MENLO after the crew had briefed and programmed the TIP TOE Visual. In the process of reprogramming the FMS; the SFO 095° radial was overshot and the aircraft descended below the 1;800' Class B floor prior to 6 DME.