Narrative:

Dal local controller released C525 runway heading; followed by the G3 a bare 3 mins behind. They realized it was very close and told the C525 'maintain maximum speed' but did not pass any information to the departure controllers. The C525 called the DR1 controller. The G3 called the DR2 controller (us). I did not see the DR1 traffic at first and the developmental controller climbed the G3 to 8000 ft without recognizing the overtake. I then saw the approximately 40 KT overtake and turned the G3; but too late to avoid a loss of separation. The local controller should not have launched a fast jet so close behind a slow jet. Our procedures should not allow 2 controllers to share the same airspace without coordination. There was very little opportunity to avoid this error.

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Original NASA ASRS Text

Title: D10 APCH CTLR EXPERIENCED OPERROR AT 6600 FT WHEN SECOND DEP ACFT OVERTOOK PRECEDING TFC.

Narrative: DAL LCL CTLR RELEASED C525 RWY HDG; FOLLOWED BY THE G3 A BARE 3 MINS BEHIND. THEY REALIZED IT WAS VERY CLOSE AND TOLD THE C525 'MAINTAIN MAX SPD' BUT DID NOT PASS ANY INFO TO THE DEP CTLRS. THE C525 CALLED THE DR1 CTLR. THE G3 CALLED THE DR2 CTLR (US). I DID NOT SEE THE DR1 TFC AT FIRST AND THE DEVELOPMENTAL CTLR CLBED THE G3 TO 8000 FT WITHOUT RECOGNIZING THE OVERTAKE. I THEN SAW THE APPROX 40 KT OVERTAKE AND TURNED THE G3; BUT TOO LATE TO AVOID A LOSS OF SEPARATION. THE LCL CTLR SHOULD NOT HAVE LAUNCHED A FAST JET SO CLOSE BEHIND A SLOW JET. OUR PROCS SHOULD NOT ALLOW 2 CTLRS TO SHARE THE SAME AIRSPACE WITHOUT COORD. THERE WAS VERY LITTLE OPPORTUNITY TO AVOID THIS ERROR.

Data retrieved from NASA's ASRS site as of January 2009 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.