Narrative:

On arrival into lax; due to multiple STAR clearances and runway changes; FMS duties increased dramatically. Additionally; multiple speed assignments and crossing altitudes were issued. After reentering STAR into FMS; failed to reselect navigation function. Consequently; aircraft stayed on a heading and drifted off the assigned STAR. After controller's query; flew assigned headings for an uneventful approach and landing.

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Original NASA ASRS Text

Title: A300-600 FLT CREW EXPERIENCES TRACK DEV WHEN MULTIPLE CHANGES IN RWY; STAR AND AIRSPEED CLRNCS CONTRIBUTES TO IMPROPER AUTOFLT MODE SELECTION.

Narrative: ON ARRIVAL INTO LAX; DUE TO MULTIPLE STAR CLEARANCES AND RUNWAY CHANGES; FMS DUTIES INCREASED DRAMATICALLY. ADDITIONALLY; MULTIPLE SPEED ASSIGNMENTS AND CROSSING ALTITUDES WERE ISSUED. AFTER REENTERING STAR INTO FMS; FAILED TO RESELECT NAV FUNCTION. CONSEQUENTLY; ACFT STAYED ON A HEADING AND DRIFTED OFF THE ASSIGNED STAR. AFTER CONTROLLER'S QUERY; FLEW ASSIGNED HEADINGS FOR AN UNEVENTFUL APPROACH AND LANDING.

Data retrieved from NASA's ASRS site as of May 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.