Narrative:

My flight was cleared for takeoff on runway 25R at lax from intersection 8J. Immediately thereafter YYY was cleared for takeoff on runway 25L -- I did not hear or understand this at the time. At approximately 1200 ft MSL we received the first of 2 TCASII RA's due to our close proximity to YYY. It was at this time that I first observed YYY at my 10 O'clock low position -- I was still climbing very steeply. Approaching our cleared altitude of 2000 ft I shallowed the climb and received a second RA. YYY had been issued a visual separation 'in trail' climb, reference my airplane. 2 important points: I was very involved managing my own airplane during the high workload takeoff period and I was not aware initially of YYY's presence or his relative position to my airplane. YYY passed me! There is little argument that it is rather difficult to maintain visual separation on another airplane when you move out front and take the lead. The chain of events that leads to an accident was, in my estimation, in the process of formation. I called back later and talked to the tower supervisor. He had talked to the controller involved. The controller saw no problem, he thought this was good controling. Now that worries me. The tower generated a problem but doesn't recognize it! Our cockpit observer told me that our airplane and YYY rotated simultaneously (approximately 800 ft lateral separation).

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Original NASA ASRS Text

Title: VISUAL SEPARATION. ATC CLRED RPTR AND LTT FOR TKOF ON PARALLEL RWYS. ATC HAD ALLEGEDLY ADVISED LTT TO MAINTAIN VISUAL SEPARATION (IN TRAIL CLB) FROM RPTR'S FLT. LTT FAILED TO REMAIN IN TRAIL AND ACTIVATED TCASII. RPTR MAINTAINED VISUAL AFTER LTT BECAME THE LEAD ACFT.

Narrative: MY FLT WAS CLRED FOR TKOF ON RWY 25R AT LAX FROM INTXN 8J. IMMEDIATELY THEREAFTER YYY WAS CLRED FOR TKOF ON RWY 25L -- I DID NOT HEAR OR UNDERSTAND THIS AT THE TIME. AT APPROX 1200 FT MSL WE RECEIVED THE FIRST OF 2 TCASII RA'S DUE TO OUR CLOSE PROX TO YYY. IT WAS AT THIS TIME THAT I FIRST OBSERVED YYY AT MY 10 O'CLOCK LOW POS -- I WAS STILL CLBING VERY STEEPLY. APCHING OUR CLRED ALT OF 2000 FT I SHALLOWED THE CLB AND RECEIVED A SECOND RA. YYY HAD BEEN ISSUED A VISUAL SEPARATION 'IN TRAIL' CLB, REF MY AIRPLANE. 2 IMPORTANT POINTS: I WAS VERY INVOLVED MANAGING MY OWN AIRPLANE DURING THE HIGH WORKLOAD TKOF PERIOD AND I WAS NOT AWARE INITIALLY OF YYY'S PRESENCE OR HIS RELATIVE POS TO MY AIRPLANE. YYY PASSED ME! THERE IS LITTLE ARGUMENT THAT IT IS RATHER DIFFICULT TO MAINTAIN VISUAL SEPARATION ON ANOTHER AIRPLANE WHEN YOU MOVE OUT FRONT AND TAKE THE LEAD. THE CHAIN OF EVENTS THAT LEADS TO AN ACCIDENT WAS, IN MY ESTIMATION, IN THE PROCESS OF FORMATION. I CALLED BACK LATER AND TALKED TO THE TWR SUPVR. HE HAD TALKED TO THE CTLR INVOLVED. THE CTLR SAW NO PROB, HE THOUGHT THIS WAS GOOD CTLING. NOW THAT WORRIES ME. THE TWR GENERATED A PROB BUT DOESN'T RECOGNIZE IT! OUR COCKPIT OBSERVER TOLD ME THAT OUR AIRPLANE AND YYY ROTATED SIMULTANEOUSLY (APPROX 800 FT LATERAL SEPARATION).

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.