Narrative:

I was first officer in medium large transport established on runway 24R loca cleared for approach, level 2500' MSL. Traffic was picked up visly at our 2 O'clock level in a right turn. The approach controller told us the traffic had us, he would pass behind us going to the left runway, we were cleared for approach to the right runway. The medium large transport B continued to a belly up right turn through our flight path. If we had not anticipated his error and climbed 500' he would have hit us in his turn. The medium large transport B passed under us and slowed dropping back to our left 8 O'clock position. He then executed a missed approach. We continued to the runway 24R runway and landed. I feel that the controller had control of the situation and we understood what was supposed to happen but medium large transport B had his head up and locked. He either did not see us or thought we were going to runway 25 or he saw someone closer to the runways and thought he saw us. One way to prevent this from happening is to require aircraft crossing another's flight path to a runway is to add an altitude restriction until the flight path is xed.

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Original NASA ASRS Text

Title: MLG ON RIGHT BASE TURNING FINAL ON A VISUAL OT LAX RWY 24L ALMOST COLLIDES WITH ANOTHER MLG WHO IS ON A VISUAL FOR RWY 24R THAT HE WAS SUPPOSED TO PASS BEHIND.

Narrative: I WAS F/O IN MLG ESTABLISHED ON RWY 24R LOCA CLRED FOR APCH, LEVEL 2500' MSL. TFC WAS PICKED UP VISLY AT OUR 2 O'CLOCK LEVEL IN A R TURN. THE APCH CTLR TOLD US THE TFC HAD US, HE WOULD PASS BEHIND US GOING TO THE L RWY, WE WERE CLRED FOR APCH TO THE R RWY. THE MLG B CONTINUED TO A BELLY UP R TURN THROUGH OUR FLT PATH. IF WE HAD NOT ANTICIPATED HIS ERROR AND CLBED 500' HE WOULD HAVE HIT US IN HIS TURN. THE MLG B PASSED UNDER US AND SLOWED DROPPING BACK TO OUR L 8 O'CLOCK POS. HE THEN EXECUTED A MISSED APCH. WE CONTINUED TO THE RWY 24R RWY AND LANDED. I FEEL THAT THE CTLR HAD CTL OF THE SITUATION AND WE UNDERSTOOD WHAT WAS SUPPOSED TO HAPPEN BUT MLG B HAD HIS HEAD UP AND LOCKED. HE EITHER DID NOT SEE US OR THOUGHT WE WERE GOING TO RWY 25 OR HE SAW SOMEONE CLOSER TO THE RWYS AND THOUGHT HE SAW US. ONE WAY TO PREVENT THIS FROM HAPPENING IS TO REQUIRE ACFT XING ANOTHER'S FLT PATH TO A RWY IS TO ADD AN ALT RESTRICTION UNTIL THE FLT PATH IS XED.

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.