Narrative:

On the evening of jan/sun/04, I (first officer) was assigned to operate a B777-200 with captain from denver to los angeles international airport. Upon arrival in the la basin we were cleared for the civet four arrival and the ILS to runway 25L. The approach was uneventful till approximately 5.5 mi from the airport, just east of the limma OM. At that location while descending through 2000 ft MSL we had 3 simultaneous events occur. 1) the TCASII system sounded an RA on a small aircraft. 2) we observed the aircraft visually at our 1 O'clock position and less than 1 mi at an altitude of 1500 ft sbound paralleling the harbor freeway. 3) the los angeles tower advised us of the same traffic. I was flying the aircraft and reacted quickly and smoothly to the RA and stopped our descent at 1900 ft. The unidented aircraft passed under us with approximately 400 ft vertical separation and no apparent lateral separation. Once the RA was concluded, we continued to configure the aircraft, complete the checklist, stabilize the approach, and completed an uneventful landing straight-in on runway 25L. Once clear of the runway, we notified ground control of our intent to file an near midair collision report. Once at the gate, we contacted the los angeles tower and completed the preliminary near midair collision report over the phone and notified station dispatch of the event. We had a short telephone debriefing with our dispatcher, the dispatch manager, and the company ATC coordinator.

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Original NASA ASRS Text

Title: A B777 FLT CREW RECEIVE A TCASII RA AND HAVE AN NMAC WHILE DSNDING INTO LAX.

Narrative: ON THE EVENING OF JAN/SUN/04, I (FO) WAS ASSIGNED TO OPERATE A B777-200 WITH CAPT FROM DENVER TO LOS ANGELES INTL ARPT. UPON ARR IN THE LA BASIN WE WERE CLRED FOR THE CIVET FOUR ARR AND THE ILS TO RWY 25L. THE APCH WAS UNEVENTFUL TILL APPROX 5.5 MI FROM THE ARPT, JUST E OF THE LIMMA OM. AT THAT LOCATION WHILE DSNDING THROUGH 2000 FT MSL WE HAD 3 SIMULTANEOUS EVENTS OCCUR. 1) THE TCASII SYS SOUNDED AN RA ON A SMALL ACFT. 2) WE OBSERVED THE ACFT VISUALLY AT OUR 1 O'CLOCK POS AND LESS THAN 1 MI AT AN ALT OF 1500 FT SBOUND PARALLELING THE HARBOR FREEWAY. 3) THE LOS ANGELES TWR ADVISED US OF THE SAME TFC. I WAS FLYING THE ACFT AND REACTED QUICKLY AND SMOOTHLY TO THE RA AND STOPPED OUR DSCNT AT 1900 FT. THE UNIDENTED ACFT PASSED UNDER US WITH APPROX 400 FT VERT SEPARATION AND NO APPARENT LATERAL SEPARATION. ONCE THE RA WAS CONCLUDED, WE CONTINUED TO CONFIGURE THE ACFT, COMPLETE THE CHKLIST, STABILIZE THE APCH, AND COMPLETED AN UNEVENTFUL LNDG STRAIGHT-IN ON RWY 25L. ONCE CLR OF THE RWY, WE NOTIFIED GND CTL OF OUR INTENT TO FILE AN NMAC RPT. ONCE AT THE GATE, WE CONTACTED THE LOS ANGELES TWR AND COMPLETED THE PRELIMINARY NMAC RPT OVER THE PHONE AND NOTIFIED STATION DISPATCH OF THE EVENT. WE HAD A SHORT TELEPHONE DEBRIEFING WITH OUR DISPATCHER, THE DISPATCH MGR, AND THE COMPANY ATC COORDINATOR.

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.