B737 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Confusion; Communication Breakdown
ATC Issue All Types; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Clearance
Air Traffic Control Issued Advisory / Alert; Air Traffic Control Issued New Clearance; Flight Crew FLC complied w / Automation / Advisory
Chart Or Publication; Human Factors; Procedure
Cleared to descend via SERFR1 STAR; 'West transition.' Queried ATC as to whether they meant the 'WESLA' transition and they responded affirmatively. Frequency change and next Controller asked where we were going. We responded we were descending VIA the WESLA transition. ATC cleared us direct MENLO for 28L. They had wanted us to descend for landing west; not WESLA transition.
B737 flight crew and ATC clearance confusion associated with the West transition versus the WESLA fix on the East transition of the SFO SERFR1 STAR.