Narrative:

Air carrier X was descending out of high altitude stratum to FL240, the aircraft called on frequency and I continued it's descent to cross 35 mi south of fwa VOR at 11000. Conflict alert activated and I told air carrier X to increase rate of descent and turn 25 degree left. I thought that this would miss aircraft Y I had at 14000 wbound from mfd to mie landing at ind. I got busy doing other tasks and when I realized that the turn was not enough it was too late to stop air carrier X descent at 15000 to maintain separation. Air carrier X was told to expedite it's descent to 13000 to try to maintain or regain separation. This did not work. The only thing I can see that would have been beneficial is that I should not have suppressed conflict alert. It would have kept me aware of the confliction still occurring.

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Original NASA ASRS Text

Title: ACR X HAD LTSS FROM ACFT Y DURING DSCNT THROUGH OCCUPIED ALT. SYS ERROR.

Narrative: ACR X WAS DSNDING OUT OF HIGH ALT STRATUM TO FL240, THE ACFT CALLED ON FREQ AND I CONTINUED IT'S DSCNT TO CROSS 35 MI S OF FWA VOR AT 11000. CONFLICT ALERT ACTIVATED AND I TOLD ACR X TO INCREASE RATE OF DSCNT AND TURN 25 DEG L. I THOUGHT THAT THIS WOULD MISS ACFT Y I HAD AT 14000 WBOUND FROM MFD TO MIE LNDG AT IND. I GOT BUSY DOING OTHER TASKS AND WHEN I REALIZED THAT THE TURN WAS NOT ENOUGH IT WAS TOO LATE TO STOP ACR X DSCNT AT 15000 TO MAINTAIN SEPARATION. ACR X WAS TOLD TO EXPEDITE IT'S DSCNT TO 13000 TO TRY TO MAINTAIN OR REGAIN SEPARATION. THIS DID NOT WORK. THE ONLY THING I CAN SEE THAT WOULD HAVE BEEN BENEFICIAL IS THAT I SHOULD NOT HAVE SUPPRESSED CONFLICT ALERT. IT WOULD HAVE KEPT ME AWARE OF THE CONFLICTION STILL OCCURRING.

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.