Narrative:

On desmond arrival into lax from the north, our flight was given large transport traffic on final for 24R. The captain called the traffic in sight, and now cleared for a visibility approach for 24R behind the large transport, began his turn to a right base leg. Just after turning base, additional medium large transport traffic was called out for runway 24L. Being slightly high, the captain called 'gear down.' during this period of time I transitioned from outside references to verify landing gear down and complete the before landing checklist, since the captain had both the arrival traffic and the field in sight. Completing the before landing checklist as the captain rolled out on final, I transitioned back outside. As I did so, the airport environment didn't look quite right, and I quickly scanned inside noting the localizer was fully deflected to the right. Just as I realized we had overshot 24R and left and were coming across for 25R, the captain realized what had happened and began an immediate correction back to the 24R centerline. As I cleared right, I saw the medium large transport behind us lining up on 24L. Both aircraft had sight of each other at this point, and we landed west/O further incident. Factors contributing to this incident were multiple traffic calls and distrs, haze, failure to constantly maintain sight of previously called traffic (large transport) and landing runway, and diversion of attention to inside cockpit duties during a more critical phase of flight. Lesson learned: delay completing before landing checklist until established on final at airports with parallel runways/sets of parallel runways.

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Original NASA ASRS Text

Title: MLG FLYING VISUAL APCH TO MULTPILE RWY ARPT OVERSHOT TURN TO FINAL AND FLEW THROUGH APCH COURSE OF PARALLEL RWY.

Narrative: ON DESMOND ARR INTO LAX FROM THE N, OUR FLT WAS GIVEN LGT TFC ON FINAL FOR 24R. THE CAPT CALLED THE TFC IN SIGHT, AND NOW CLRED FOR A VIS APCH FOR 24R BEHIND THE LGT, BEGAN HIS TURN TO A RIGHT BASE LEG. JUST AFTER TURNING BASE, ADDITIONAL MLG TFC WAS CALLED OUT FOR RWY 24L. BEING SLIGHTLY HIGH, THE CAPT CALLED 'GEAR DOWN.' DURING THIS PERIOD OF TIME I TRANSITIONED FROM OUTSIDE REFERENCES TO VERIFY LNDG GEAR DOWN AND COMPLETE THE BEFORE LNDG CHKLIST, SINCE THE CAPT HAD BOTH THE ARR TFC AND THE FIELD IN SIGHT. COMPLETING THE BEFORE LNDG CHKLIST AS THE CAPT ROLLED OUT ON FINAL, I TRANSITIONED BACK OUTSIDE. AS I DID SO, THE ARPT ENVIRONMENT DIDN'T LOOK QUITE RIGHT, AND I QUICKLY SCANNED INSIDE NOTING THE LOC WAS FULLY DEFLECTED TO THE RIGHT. JUST AS I REALIZED WE HAD OVERSHOT 24R AND L AND WERE COMING ACROSS FOR 25R, THE CAPT REALIZED WHAT HAD HAPPENED AND BEGAN AN IMMEDIATE CORRECTION BACK TO THE 24R CENTERLINE. AS I CLRED RIGHT, I SAW THE MLG BEHIND US LINING UP ON 24L. BOTH ACFT HAD SIGHT OF EACH OTHER AT THIS POINT, AND WE LANDED W/O FURTHER INCIDENT. FACTORS CONTRIBUTING TO THIS INCIDENT WERE MULTIPLE TFC CALLS AND DISTRS, HAZE, FAILURE TO CONSTANTLY MAINTAIN SIGHT OF PREVIOUSLY CALLED TFC (LGT) AND LNDG RWY, AND DIVERSION OF ATTN TO INSIDE COCKPIT DUTIES DURING A MORE CRITICAL PHASE OF FLT. LESSON LEARNED: DELAY COMPLETING BEFORE LNDG CHKLIST UNTIL ESTABLISHED ON FINAL AT ARPTS WITH PARALLEL RWYS/SETS OF PARALLEL RWYS.

Data retrieved from NASA's ASRS site as of August 2007 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.