Narrative:

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 first officer 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.

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Original NASA ASRS Text

Title: 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.

Narrative: 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.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.