B737 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
No Specific Anomaly Occurred All Types
General None Reported / Taken
Chart Or Publication; Procedure
I am writing to bring a charting issue to your attention on the new SFO DYAMD2 STAR. The published altitude and speed restriction at ARCHI intersection is 7;000 feet and 230 kts. On the ILS 28R; the published altitude at ARCHI intersection is also 7;000 feet. First; we are being told by our flight department that ARCHI intersection at 7;000 feet is BELOW the current floor of the SFO Class B airspace.  If this is true; then the published speed of 230 kts. at ARCHI is in direct violation to the 200 kt. speed limit below Class B airspace. If ARCHI at 7;000 feet is below the floor of the Class B airspace; why would there be a published altitude on a STAR that would put an airplane below the floor of the Class B airspace? I have also learned that the floor of the SFO Class B airspace was supposed to have been lowered from 8;000 feet to 7;000 feet with the introduction of the DYAMD2 STAR; but supposedly that has yet to happen. If this is true; then it will take care of the speed limit issue.The other main issue is that on the DYAMD2; ARCHI is listed at 7;000 feet; and on the FMS Bridge Visual approach; the published altitude at ARCHI is 8;000 feet. This is creating confusion between pilots and ATC when given a 'Descend Via' clearance. Most of the time SFO ATC uses the FMS Bridge Visual approach; which causes confusion regarding the correct altitude at ARCHI. The ATC Center gives pilots the clearance to 'Descend Via the DYAMD2 STAR' which has 7;000 feet as the bottom altitude; but then as you are descending on the arrival; the SFO ATC Approach controller then clears you only to 8;000 feet; thereby increasing the work load and chances of busting a speed or altitude restriction. So; in order to relieve any confusion; publishing the same altitude at ARCHI on all approach plates and STARS would be much better. This would alleviate any question about the speed limit issue below the Class B airspace; as well as have all the altitudes at ARCHI all be the same. I have also been informed that the STARs are basically created for transitions for instrument approaches; and not visual approaches. This does hold true because the altitude for ARCHI on the DYAMD2 and on the ILS 28R are both 7;000 feet. However; It would be much easier for both pilots and ATC if all the altitudes for ARCHI intersection were all the same on all the STARs and approach plates; no matter whether they are visual or instrument approaches.
B737 First Officer reported the SFO DYAMD2 STAR may have some errors related to Class B floor.