Pilot reports of flying below the class bravo while in a descent into sfo on the SERFR1 STAR. Pilot ...

Narrative:

Shortly before top of descent oakland center changed our arrival to the serfr 1 RNAV arrival. We flew the arrival remaining in VNAV path the entire way and complying with all restrictions. Upon handoff to norcal approach; oakland center commented that we had briefly gone below sfo class B duing our descent. Descending below class B while complying with an arrival published for a primary airport is something neither of us would have considered. This appears to be a new procedure and it looks like it still needs to be adjusted. The fact that the path and restrictions allow for you to go below class B while flying an arrival designed for aircraft landing at the primary airport is counterintuitive. Furthermore; complying with the arrival would not allow for a speed reduction. Crews and ATC should discontiue use of this arrival until the arrival or airspace can be adjusted. Internally our company should consider a NOTAM and/or 10-7 note to discontiue use until this technicality is resolved.

Original NASA ASRS Text

Title: Pilot reports of flying below the Class Bravo while in a descent into SFO on the SERFR1 STAR. Pilot advises there may be something wrong with the arrival that takes the aircraft out of the Class Bravo which is built to protect the aircraft.

Narrative: Shortly before top of descent Oakland Center changed our arrival to the SERFR 1 RNAV arrival. We flew the arrival remaining in VNAV path the entire way and complying with all restrictions. Upon handoff to NorCal Approach; Oakland Center commented that we had briefly gone below SFO class B duing our descent. Descending below class B while complying with an arrival published for a primary airport is something neither of us would have considered. This appears to be a new procedure and it looks like it still needs to be adjusted. The fact that the path and restrictions allow for you to go below Class B while flying an arrival designed for aircraft landing at the primary airport is counterintuitive. Furthermore; complying with the arrival would not allow for a speed reduction. Crews and ATC should discontiue use of this arrival until the arrival or airspace can be adjusted. Internally our company should consider a NOTAM and/or 10-7 note to discontiue use until this technicality is resolved.

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.

Attributes
ACN	1246741
Time
Date	201503
Local Time Of Day	0001-0600
Place
Locale Reference	ZOA.ARTCC
State Reference	CA
Aircraft 1
Make Model Name	Medium Large Transport
Operating Under FAR Part	Part 121
Flight Phase	Descent
Route In Use	STAR SERFR 1
Flight Plan	IFR
Person 1
Function	Pilot Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	ATC Issue All Types Airspace Violation All Types Deviation - Procedural FAR

Pilot reports of flying below the class bravo while in a descent into sfo on the SERFR1 STAR. Pilot advises there may be something wrong with the arrival that takes the aircraft out of the class bravo which is built to protect the aircraft.