Narrative:

Incident occurred while executing the loop 9 departure at lax. Position at time of first ATC alert was lax VOR 041 degree radial approximately 10 NM 15000 ft. ZLA reported contact at about 10-11 O'clock 8 NM. ZLA cleared us to FL230. We acknowledged the clearance but almost immediately a different controller's voice told us to maintain 15000 ft which we acknowledged. ZLA then reported the target at about 3 NM and converging. Visual contact made by captain at about 3 NM. First officer was flying. TCASII RA to descend was executed immediately. Time was XA29Z. Position lax VOR 041 degree radial 18.8 NM. Target passed overhead at about 500-800 ft. At that point we were at 14600 ft. ZLA was advised of the TCASII evasive action.

Related reports:

Google
 

Original NASA ASRS Text

Title: FLC OF ACR WDB ACFT TOOK EVASIVE ACTION IN RESPONSE TO A TCASII RA.

Narrative: INCIDENT OCCURRED WHILE EXECUTING THE LOOP 9 DEP AT LAX. POS AT TIME OF FIRST ATC ALERT WAS LAX VOR 041 DEG RADIAL APPROX 10 NM 15000 FT. ZLA RPTED CONTACT AT ABOUT 10-11 O'CLOCK 8 NM. ZLA CLRED US TO FL230. WE ACKNOWLEDGED THE CLRNC BUT ALMOST IMMEDIATELY A DIFFERENT CTLR'S VOICE TOLD US TO MAINTAIN 15000 FT WHICH WE ACKNOWLEDGED. ZLA THEN RPTED THE TARGET AT ABOUT 3 NM AND CONVERGING. VISUAL CONTACT MADE BY CAPT AT ABOUT 3 NM. FO WAS FLYING. TCASII RA TO DSND WAS EXECUTED IMMEDIATELY. TIME WAS XA29Z. POS LAX VOR 041 DEG RADIAL 18.8 NM. TARGET PASSED OVERHEAD AT ABOUT 500-800 FT. AT THAT POINT WE WERE AT 14600 FT. ZLA WAS ADVISED OF THE TCASII EVASIVE ACTION.

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.