Narrative:

I was working moderate traffic on sector 29 radar. The rides at or above FL290 was moderate chop. FL270 was a much better side. I was sequencing overflt traffic to cvg and sequencing stl-dfw departures with an overflt ord-dfw traffic. Air carrier X was at FL330 with a bad ride. I descended air carrier X to FL290. Air carrier Y was at FL280. I felt I had lateral separation. After sequencing the stl-dfw, and the ord-dfw aircraft, I continued my scan and issued air carrier Y a 30 degree right turn and air carrier X a 30 degree right turn. The turns were not enough and I had one update at 4.34 mi and every other update was at 5 mi or greater. The reason this happened was trying to provide good service because the rides were so bad. I ran them too tight and came up short. Had this been in the terminal option, this would have been no error because the aircraft had diverged. But in the center, you can catch them on the backside.

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Original NASA ASRS Text

Title: ZKC CTLR MISJUDGES LATERAL SPACING NEEDED TO MAINTAIN SEPARATION WITH A DSNDING ACR AND INCURS AN OPERROR.

Narrative: I WAS WORKING MODERATE TFC ON SECTOR 29 RADAR. THE RIDES AT OR ABOVE FL290 WAS MODERATE CHOP. FL270 WAS A MUCH BETTER SIDE. I WAS SEQUENCING OVERFLT TFC TO CVG AND SEQUENCING STL-DFW DEPS WITH AN OVERFLT ORD-DFW TFC. ACR X WAS AT FL330 WITH A BAD RIDE. I DSNDED ACR X TO FL290. ACR Y WAS AT FL280. I FELT I HAD LATERAL SEPARATION. AFTER SEQUENCING THE STL-DFW, AND THE ORD-DFW ACFT, I CONTINUED MY SCAN AND ISSUED ACR Y A 30 DEG R TURN AND ACR X A 30 DEG R TURN. THE TURNS WERE NOT ENOUGH AND I HAD ONE UPDATE AT 4.34 MI AND EVERY OTHER UPDATE WAS AT 5 MI OR GREATER. THE REASON THIS HAPPENED WAS TRYING TO PROVIDE GOOD SVC BECAUSE THE RIDES WERE SO BAD. I RAN THEM TOO TIGHT AND CAME UP SHORT. HAD THIS BEEN IN THE TERMINAL OPTION, THIS WOULD HAVE BEEN NO ERROR BECAUSE THE ACFT HAD DIVERGED. BUT IN THE CTR, YOU CAN CATCH THEM ON THE BACKSIDE.

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.