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D10 controller providing OJT; experienced operational error at 4000 ft; as developmental controller issued descent through occupied altitude without enough separation.
| Attributes | |
| ACN | 677074 |
| Time | |
| Date | 200511 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : dfw.airport |
| State Reference | TX |
| Altitude | msl single value : 4000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : d10.tracon |
| Operator | general aviation : personal |
| Make Model Name | PA-31T-X2 Cheyenne XL |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : intermediate altitude |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : d10.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller military : 2 controller radar : 23 |
| ASRS Report | 677074 |
| Person 2 | |
| Function | controller : approach instruction : trainee |
| Qualification | controller : developmental |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 15000 vertical : 800 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I was conducting OJT on the dallas north position at D10 TRACON. We received handoffs of the PAY3 at 4000 ft eastbound on the north airway. (The north 6 mi of our airspace.) going to dal; and a B737 on same route at 7000 ft going to dal also. The trainee turned the B737 and descended to 3000 ft. Separation was lost when the B737 left 5000 ft because there was only 14 degrees of divergence. I thought it was enough. I found out it was 14 degrees in the replay.
Original NASA ASRS Text
Title: D10 CTLR PROVIDING OJT; EXPERIENCED OPERROR AT 4000 FT; AS DEVELOPMENTAL CTLR ISSUED DSCNT THROUGH OCCUPIED ALT WITHOUT ENOUGH SEPARATION.
Narrative: I WAS CONDUCTING OJT ON THE DALLAS N POS AT D10 TRACON. WE RECEIVED HDOFS OF THE PAY3 AT 4000 FT EBOUND ON THE N AIRWAY. (THE N 6 MI OF OUR AIRSPACE.) GOING TO DAL; AND A B737 ON SAME RTE AT 7000 FT GOING TO DAL ALSO. THE TRAINEE TURNED THE B737 AND DSNDED TO 3000 FT. SEPARATION WAS LOST WHEN THE B737 LEFT 5000 FT BECAUSE THERE WAS ONLY 14 DEGS OF DIVERGENCE. I THOUGHT IT WAS ENOUGH. I FOUND OUT IT WAS 14 DEGS IN THE REPLAY.
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.