Narrative:

I was working sectors 23 and 54 combined. Sector very busy, complex traffic, mlt X flight sbound at FL200. Conflict alert activated for faster traffic behind at FL200. Mlt X cleared to FL230. Medium large transport Y northbound at FL210 was traffic. Conflict alert activated too late. Aircraft passed about 3 mi and 200 ft. Medium large transport Y climbed in response to TCASII RA.

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Original NASA ASRS Text

Title: ARTCC RADAR CTLR WORKING 2 SECTORS COMBINED CLBED A C141 FLT OF 2 THROUGH THE ALT OF A G4 WITH LTSS. TFC VOLUME WAS HVY AND COMPLEX AND THE CONFLICT ALERT WAS TOO LATE TO HELP THE CTLR SEE THE POTENTIAL CONFLICT.

Narrative: I WAS WORKING SECTORS 23 AND 54 COMBINED. SECTOR VERY BUSY, COMPLEX TFC, MLT X FLT SBOUND AT FL200. CONFLICT ALERT ACTIVATED FOR FASTER TFC BEHIND AT FL200. MLT X CLRED TO FL230. MLG Y NBOUND AT FL210 WAS TFC. CONFLICT ALERT ACTIVATED TOO LATE. ACFT PASSED ABOUT 3 MI AND 200 FT. MLG Y CLBED IN RESPONSE TO TCASII RA.

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.