Narrative:

A F2TH on departure from dal was climbed on runway heading to 70. Trainee was to have been 'quick looking' feeder east which I learned subsequently he/she was not doing. The other aircraft; a C650; was descending into dal on a procedure know as 'over the top' which I have previously reported. The trainee; not knowing that the C650 was coming over the top; turned the F2TH to a 260 heading and climbed him to 170. The trainee also displayed this aircraft to feeder east as per the procedure. By this time the trainee realized the C650 was coming over and turned the F2TH to a 270 heading which obviously wasn't enough for diverging courses. I also did not see the aircraft coming over as we had just been on the land line with fort worth center about another matter and I didn't have time to scan before the trainee executed this procedure. I should also add that the C650 was in the main bang for an extended amount of time. Another issue with these over the top aircraft is that they don't seem to get any body's attention. Also; feeder east should have displayed this aircraft to us as it got withing 1 1/2 miles of our airspace. Something that is covered in our pre-coordinated agreement. They did not until it was too late. Although; I take full and complete responsibility as the instructor in this scenario; I continuously object to this unsafe procedure. There are just too many aircraft climbing and descending in this corridor to overlook safety for some one's convenience. I understand this is 'always how we've done it'. I find it difficult to believe that no one else has an issue with this procedure. I've worked at other busy FAA facilities; and have never encountered a more dangerous scenario.

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Original NASA ASRS Text

Title: D10 Controller providing OJT; described a loss of separation event involving the DAL 'Over The Top' procedure.

Narrative: A F2TH on departure from DAL was climbed on runway heading to 70. Trainee was to have been 'quick looking' Feeder East which I learned subsequently he/she was not doing. The other aircraft; a C650; was descending into DAL on a procedure know as 'over the top' which I have previously reported. The trainee; not knowing that the C650 was coming over the top; turned the F2TH to a 260 heading and climbed him to 170. The trainee also displayed this aircraft to Feeder East as per the procedure. By this time the trainee realized the C650 was coming over and turned the F2TH to a 270 heading which obviously wasn't enough for diverging courses. I also did not see the aircraft coming over as we had just been on the land line with Fort Worth Center about another matter and I didn't have time to scan before the trainee executed this procedure. I should also add that the C650 was in the main bang for an extended amount of time. Another issue with these over the top aircraft is that they don't seem to get any body's attention. Also; Feeder East should have displayed this aircraft to us as it got withing 1 1/2 miles of our airspace. Something that is covered in our pre-coordinated agreement. They did not until it was too late. Although; I take full and complete responsibility as the instructor in this scenario; I continuously object to this unsafe procedure. There are just too many aircraft climbing and descending in this corridor to overlook safety for some one's convenience. I understand this is 'always how we've done it'. I find it difficult to believe that no one else has an issue with this procedure. I've worked at other busy FAA facilities; and have never encountered a more dangerous scenario.

Data retrieved from NASA's ASRS site as of April 2012 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.