Narrative:

Planned on SEAVU1 runway 25L arrival lax. Passing konzl and 17000 ft given seavu runway 24R. First officer (pilot monitoring) began rebuilding approach whilst captain flew the arrival. At approximately 12000 ft approaching dixxn; los angeles approach changed landing runway to runway 25L. (At luvyn; the runway 25L and runway 24R approachs take different ground tracks.) without a valid navigation display; the captain flew an estimated heading to krain; while first officer rebuilt the approach the second time. When correct navigation display was reinserted; the crew realized that aircraft ground track deviated slightly north of prescribed track. The remainder of the approach and landing was uneventful. The reloading of the arrival was exacerbated by the extremely slow FMC processor in the A300. We did not perceive any loss of separation; nor did we receive any calls or comments from los angeles approach control.

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Original NASA ASRS Text

Title: AN ACR CREW ON THE LAX SEAVU ONE ARRIVAL WAS GIVEN THREE RWY CHANGES AND BECAME DISTRACTED CAUSING A TRACK DEVIATION DURING FMS PROGRAMMING.

Narrative: PLANNED ON SEAVU1 RWY 25L ARR LAX. PASSING KONZL AND 17000 FT GIVEN SEAVU RWY 24R. FO (PLT MONITORING) BEGAN REBUILDING APCH WHILST CAPT FLEW THE ARR. AT APPROX 12000 FT APCHING DIXXN; LOS ANGELES APCH CHANGED LNDG RWY TO RWY 25L. (AT LUVYN; THE RWY 25L AND RWY 24R APCHS TAKE DIFFERENT GND TRACKS.) WITHOUT A VALID NAV DISPLAY; THE CAPT FLEW AN ESTIMATED HDG TO KRAIN; WHILE FO REBUILT THE APCH THE SECOND TIME. WHEN CORRECT NAV DISPLAY WAS REINSERTED; THE CREW REALIZED THAT ACFT GND TRACK DEVIATED SLIGHTLY N OF PRESCRIBED TRACK. THE REMAINDER OF THE APCH AND LNDG WAS UNEVENTFUL. THE RELOADING OF THE ARR WAS EXACERBATED BY THE EXTREMELY SLOW FMC PROCESSOR IN THE A300. WE DID NOT PERCEIVE ANY LOSS OF SEPARATION; NOR DID WE RECEIVE ANY CALLS OR COMMENTS FROM LOS ANGELES APCH CTL.

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.