2010-02 · NASA ASRS report 875552
D10 controller providing OJT described a probable loss of separation event when he/she issued a turn to a T38 that may have conflicted with other traffic because of the wide turn radius.
Aircraft Y turning final at FTW 2400 descending. Aircraft X; a T38; departed AFW filed west over FERRA intersection. Trainee turned the T38 and climbed him to 8000 to avoid an ATR72 off DFW at 4000 southwest bound. There was no loss between the T38 and ATR72; but the T38 slid in the turn and I believe may have gotten withing the 3 mile ring before divergence or vertical was achieved. The maneuver could have worked but (Aircraft Y) was cleared for the visual approach at 3500 and actually climbed to 3900 and therefore took much longer to descend. I believe the closest the aircraft got was 2.5 miles or 800 feet. Also; we may have achieved divergence prior to the loss I am reporting. Recommendation; more training and monitoring for the trainee; and more control from the instructor. Sometimes you have to let the trainee work the traffic; and be prepared to take action. The only action that would have prevented this occurrence would have been to cancel out the instruction; but this may have resulted in a much worse situation because the T38; which is usually a training flight; would have started the read back and executing the control instructions and by the time they corrected back and it would have ended up much worse and the ATR72 southwest bound would also have been involved.
Aircraft X was released off of Runway 16L at AFW runway heading and 2500 ft. Aircraft Y was cleared for a visual approach into Runway 16 at FTW. When the Aircraft X departed he was issued a turn to 300 and climb to 8000 ft. I anticipated that he would turn behind Aircraft Y with no problem because of his type; but he swung his turn wide and a loss occurred between Aircraft Y on final. Recommendation; I should have waited for the aircraft altitudes to completely pass and/or waited to release the departure.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.
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