Narrative:

Flight bos-lax. While on final approach to runway 25L the approach controller advised us of a brasilia on an intercept heading for runway 25R at our 2-3 O'clock position. The first officer finally spotted the aircraft and to his shock, advised me that it looked as if he was going to overshoot his runway 25R centerline. The first officer kept an eye on him and advised me to alter our track left. The tower controller then advised me of helicopter traffic to the left also. Not knowing the exact position of the brasilia, it made a choice to go around difficult. I moved slightly left upon advice of the first officer, also increasing our speed to put distance between both aircraft. The brasilia kept pace, then we received an RA to descend. My concern besides the helicopter was, if a go around was initiated, would our wake turbulence (B757) place the brasilia in jeopardy? If I had known what the controller was trying to do early on I would have abandoned the approach. I question the wisdom of both the controller and the acceptance by the brasilia pilot. I do not like being placed in a situation where little or no options exist. Both aircraft landed without incident.

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Original NASA ASRS Text

Title: B757 PIC RPT ON A POTENTIAL CONFLICT WHILE ON THE ILS APCH TO RWY 25L AT LAX. AN ACR COMMUTER OVERSHOT THE EXTENDED LINE OF RWY 25R AND CREATED A TRYING EXPERIENCE FOR HIM. PIC DEALT WITH THE DECISION MAKING PROCESS FOR AVOIDANCE AND THE PROBS THAT INFLUENCED THAT PROCESS.

Narrative: FLT BOS-LAX. WHILE ON FINAL APCH TO RWY 25L THE APCH CTLR ADVISED US OF A BRASILIA ON AN INTERCEPT HEADING FOR RWY 25R AT OUR 2-3 O'CLOCK POS. THE FO FINALLY SPOTTED THE ACFT AND TO HIS SHOCK, ADVISED ME THAT IT LOOKED AS IF HE WAS GOING TO OVERSHOOT HIS RWY 25R CTRLINE. THE FO KEPT AN EYE ON HIM AND ADVISED ME TO ALTER OUR TRACK L. THE TWR CTLR THEN ADVISED ME OF HELI TFC TO THE L ALSO. NOT KNOWING THE EXACT POS OF THE BRASILIA, IT MADE A CHOICE TO GAR DIFFICULT. I MOVED SLIGHTLY L UPON ADVICE OF THE FO, ALSO INCREASING OUR SPD TO PUT DISTANCE BTWN BOTH ACFT. THE BRASILIA KEPT PACE, THEN WE RECEIVED AN RA TO DSND. MY CONCERN BESIDES THE HELI WAS, IF A GAR WAS INITIATED, WOULD OUR WAKE TURB (B757) PLACE THE BRASILIA IN JEOPARDY? IF I HAD KNOWN WHAT THE CTLR WAS TRYING TO DO EARLY ON I WOULD HAVE ABANDONED THE APCH. I QUESTION THE WISDOM OF BOTH THE CTLR AND THE ACCEPTANCE BY THE BRASILIA PLT. I DO NOT LIKE BEING PLACED IN A SIT WHERE LITTLE OR NO OPTIONS EXIST. BOTH ACFT LANDED WITHOUT INCIDENT.

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.