Commercial Fixed Wing
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Confusion
ATC Issue All Types; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued New Clearance
Chart Or Publication; Human Factors; Procedure
Briefed the RNDRZ1 approach...and company messages.  After BERBN; aircraft started initial turn to left. Flight crew corrected and turned heading to 079 ...however; at same time; ATC gave us a heading of 080.  Vectors to follow traffic on final.  Called both traffic and field in sight; turned final behind [another airline] traffic; normal approach and landing.  Advised on taxi to gate; to call LAS approach. Had nice conversation with Controller...who advised...that over 300 airplanes have had identical situation occur.  (Fairly new procedure in effect).  Situation notified; and no aircraft deviations had occurred.Our confusion; per the Jeppesen page…says…Expect a heading of 079...Absent any addition ATC instructions... FMC is programmed to turn left; and join the transition to the runway.   Interesting note...if over 300 aircraft have done same...why not have Approach Controller…confirm a heading after BERBN Intersection...as this is a new set up in the approaches to LAS?
Validated the Arrival/CA briefed approach. The company messages regarding LAS were discussed. After BERBN on the RNDRZ 1 arrival; the aircraft FMS initiated a left turn towards the northeast. We caught this at which time a correction was applied; but before correction was commenced ATC initiated a turn to a 080 heading. When the vector was instructed; traffic was called for the other aircraft on straight in final; and at that time visual contact was established and reported to ATC. We were advised to maintain visual separation and cleared the visual approach. A normal approach to landing was made with no traffic advisories (TA) or resolution advisories (RA).We specifically discussed what to expect if cleared for the visual vs an instrument approach after BERBN; yet the automation management threat was not trapped. The LAS STAR is confusing as to what to expect when waiting for an approach clearance.  We never received any additional ATC instructions on what to expect after BERBN and when the aircraft began to turn this created a confusing environment.This procedure at LAS should be simplified and more awareness needs to be presented. It would be beneficial if ATC could provide (for example) 'Fly 080 heading after BERBN this is radar vectors expect the visual approach' OR 'Anticipate BERBN for the instrument approach clearance'. Also; would help if ATC would be willing to give a heads up in the NOTAMs.  Also; include a message on the release when flying into this airport.
Air carrier flight crew reported an issue on the RNDRZ1 approach and possible confusion with how the chart is written. Crew also noted that ATC advised that over 300 aircraft have had the same situation occur.