Narrative:

I was first officer on a flight to lax. We were involved in a near miss situation while on the arrival into lax. Descending on the pdz 3 arrival, we passed less than 1 mi horizontal and 200 ft vertical with an opposite direction light twin. ATC was notified of descent and return to altitude after RA passage. Other aircraft evidently had visual contact with wrong aircraft. Contributing factors: 1) STAR changed 3 times. 2) runway changed twice. 3) direction of airport operations changed, increasing controller workload as well as ours. 4) radio congestion. 5) other pilot's improper recognition of traffic. TCASII worked, we were on proper course and altitude.

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Original NASA ASRS Text

Title: AN ACR A320 FLC HAD A CLOSE ENCOUNTER WITH A LIGHT TWIN ENG ACFT WHILE ON A STAR TO LAX.

Narrative: I WAS FO ON A FLT TO LAX. WE WERE INVOLVED IN A NEAR MISS SIT WHILE ON THE ARR INTO LAX. DSNDING ON THE PDZ 3 ARR, WE PASSED LESS THAN 1 MI HORIZ AND 200 FT VERT WITH AN OPPOSITE DIRECTION LIGHT TWIN. ATC WAS NOTIFIED OF DSCNT AND RETURN TO ALT AFTER RA PASSAGE. OTHER ACFT EVIDENTLY HAD VISUAL CONTACT WITH WRONG ACFT. CONTRIBUTING FACTORS: 1) STAR CHANGED 3 TIMES. 2) RWY CHANGED TWICE. 3) DIRECTION OF ARPT OPS CHANGED, INCREASING CTLR WORKLOAD AS WELL AS OURS. 4) RADIO CONGESTION. 5) OTHER PLT'S IMPROPER RECOGNITION OF TFC. TCASII WORKED, WE WERE ON PROPER COURSE AND ALT.

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