Narrative:

I was working third local on plan weird. I coordinated with north local that his runway 32R mzv departure would go on a 270 degree heading outside my 32L-T10 departure. Who would be on a 220 degree heading. I cleared air carrier X for takeoff from 32L-T10, and told him to turn left, heading 220 degrees. I asked air carrier X to keep the turn tight and advised him that traffic would be outside him from runway 32R. I gave a relief briefing to the atcs and developmental that were plugging in. After I had unplugged, the atcs said that air carrier X did not appear to be turning to the 220 degree heading. He contacted approach control who asked them to turn the aircraft.

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Original NASA ASRS Text

Title: ORD LCL CTLR MISJUDGED DEP ACFT TURN RATE RESULTING IN LOSS OF SEPARATION.

Narrative: I WAS WORKING THIRD LCL ON PLAN WEIRD. I COORDINATED WITH N LCL THAT HIS RWY 32R MZV DEP WOULD GO ON A 270 DEG HDG OUTSIDE MY 32L-T10 DEP. WHO WOULD BE ON A 220 DEG HDG. I CLRED ACR X FOR TKOF FROM 32L-T10, AND TOLD HIM TO TURN L, HEADING 220 DEGS. I ASKED ACR X TO KEEP THE TURN TIGHT AND ADVISED HIM THAT TFC WOULD BE OUTSIDE HIM FROM RWY 32R. I GAVE A RELIEF BRIEFING TO THE ATCS AND DEVELOPMENTAL THAT WERE PLUGGING IN. AFTER I HAD UNPLUGGED, THE ATCS SAID THAT ACR X DID NOT APPEAR TO BE TURNING TO THE 220 DEG HDG. HE CONTACTED APCH CTL WHO ASKED THEM TO TURN THE ACFT.

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.