Narrative:

Descending into lax on autoplt during moderate turbulence and using a STAR I've never used before en route to a runway neither the first officer nor I have ever landed on (runway 7L); we failed to turn and track outbound from reedr intersection. The aircraft continued on previous heading and did not make the turn. Approach control asked our heading; and before we could answer him; he vectored us in the direction we should have been going. No conflict occurred. Contributing factors include a vector off the STAR a few minutes earlier; the clearance to a fix on the STAR that was part of another transition. Then we were cleared to continue the STAR from that fix. When approaching the turn point we missed; approach control changed our runway assignment. PF reselected the runway on the FMS and apparently the LNAV dropped out when he did so. The distraction of the new STAR; moderate turbulence; reclearance to a different transition and finally a last minute change all contributed to this event. Why can't approach control in lax stick to their original plan? With FMS programming; going into lax is almost always a goat rope! One of these days these continual last minute changes may cause a serious conflict.

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Original NASA ASRS Text

Title: A B757-200 MISSED THE LAX REEDR3 STAR TURN AT REEDR INTXN AFTER A VECTOR OFF THE ARR AND A RWY CHANGE REQUIRED AN FMS PROGRAMMING CHANGE.

Narrative: DESCENDING INTO LAX ON AUTOPLT DURING MODERATE TURB AND USING A STAR I'VE NEVER USED BEFORE ENRTE TO A RWY NEITHER THE FO NOR I HAVE EVER LANDED ON (RWY 7L); WE FAILED TO TURN AND TRACK OUTBOUND FROM REEDR INTXN. THE ACFT CONTINUED ON PREVIOUS HDG AND DID NOT MAKE THE TURN. APCH CTL ASKED OUR HDG; AND BEFORE WE COULD ANSWER HIM; HE VECTORED US IN THE DIRECTION WE SHOULD HAVE BEEN GOING. NO CONFLICT OCCURRED. CONTRIBUTING FACTORS INCLUDE A VECTOR OFF THE STAR A FEW MINUTES EARLIER; THE CLRNC TO A FIX ON THE STAR THAT WAS PART OF ANOTHER TRANSITION. THEN WE WERE CLRED TO CONTINUE THE STAR FROM THAT FIX. WHEN APCHING THE TURN POINT WE MISSED; APCH CTL CHANGED OUR RWY ASSIGNMENT. PF RESELECTED THE RWY ON THE FMS AND APPARENTLY THE LNAV DROPPED OUT WHEN HE DID SO. THE DISTRACTION OF THE NEW STAR; MODERATE TURB; RECLEARANCE TO A DIFFERENT TRANSITION AND FINALLY A LAST MINUTE CHANGE ALL CONTRIBUTED TO THIS EVENT. WHY CAN'T APCH CTL IN LAX STICK TO THEIR ORIGINAL PLAN? WITH FMS PROGRAMMING; GOING INTO LAX IS ALMOST ALWAYS A GOAT ROPE! ONE OF THESE DAYS THESE CONTINUAL LAST MINUTE CHANGES MAY CAUSE A SERIOUS CONFLICT.

Data retrieved from NASA's ASRS site as of January 2009 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.