Narrative:

Was working with tracker. Tracker went off line with coordination and I issued descent to FL240. Data block was not updated -- showed FL260. Air carrier descended below FL260 into traffic at FL250. Simple case of data block not updated -- operating on incorrect information.

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Original NASA ASRS Text

Title: CTLR AT ZID DSNDED ACR TO ALT OCCUPIED BY BUSINESS JET RESULTING IN OPERROR.

Narrative: WAS WORKING WITH TRACKER. TRACKER WENT OFF LINE WITH COORD AND I ISSUED DSCNT TO FL240. DATA BLOCK WAS NOT UPDATED -- SHOWED FL260. ACR DSNDED BELOW FL260 INTO TFC AT FL250. SIMPLE CASE OF DATA BLOCK NOT UPDATED -- OPERATING ON INCORRECT INFO.

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.