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D10 controller experienced operational error at 2100 ft when dal local controller issued an unexpected early turn to a go around that conflicted with an ads arrival.
| Attributes | |
| ACN | 702459 |
| Time | |
| Date | 200607 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : cve.vor |
| State Reference | TX |
| Altitude | msl single value : 2100 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : ads.tower |
| Operator | common carrier : air carrier |
| Make Model Name | EMB ERJ 145 ER&LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | landing : go around |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : d10.tracon |
| Operator | general aviation : corporate |
| Make Model Name | Learjet 45 |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | ils localizer & glide slope : 33 |
| Flight Phase | descent : approach |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller radar : 17 controller time certified in position2 : 3 |
| ASRS Report | 702459 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : local |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | none taken : insufficient time |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 25840 vertical : 400 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Learjet was vectored southwest to the addison ILS runway 33 final approach course. Dallas love ATCT (dal) coordination an air carrier X that was 'requesting a go around (runway 31R) what would you like him to do? I coordination a heading of 340 degrees and a climb to 4000 ft with the expectation that dal ATCT would not initiate the instructions prior to the departure end of dal runway 31R. I turned and cleared the learjet for the ILS 33 approach at ads; after slowing him to 170 KTS due to strong northeast winds aloft. Air carrier X was instructed by dal ATCT to fly my assigned heading prior to the approach end of dal runway 31R. I observed this early and unexpected turn and verified with dal ATCT that he was commencing the assigned climb. The embraer at 2100 ft converged with the learjet at 2500 ft and separation was lost. I had no reasonable expectation that these 2 aircraft should ever be a factor for one another. Facility LOA's and SOP's are currently being reviewed as a result of this event.
Original NASA ASRS Text
Title: D10 CTLR EXPERIENCED OPERROR AT 2100 FT WHEN DAL LCL CTLR ISSUED AN UNEXPECTED EARLY TURN TO A GAR THAT CONFLICTED WITH AN ADS ARR.
Narrative: LEARJET WAS VECTORED SW TO THE ADDISON ILS RWY 33 FINAL APCH COURSE. DALLAS LOVE ATCT (DAL) COORD AN ACR X THAT WAS 'REQUESTING A GAR (RWY 31R) WHAT WOULD YOU LIKE HIM TO DO? I COORD A HDG OF 340 DEGS AND A CLB TO 4000 FT WITH THE EXPECTATION THAT DAL ATCT WOULD NOT INITIATE THE INSTRUCTIONS PRIOR TO THE DEP END OF DAL RWY 31R. I TURNED AND CLRED THE LEARJET FOR THE ILS 33 APCH AT ADS; AFTER SLOWING HIM TO 170 KTS DUE TO STRONG NE WINDS ALOFT. ACR X WAS INSTRUCTED BY DAL ATCT TO FLY MY ASSIGNED HDG PRIOR TO THE APCH END OF DAL RWY 31R. I OBSERVED THIS EARLY AND UNEXPECTED TURN AND VERIFIED WITH DAL ATCT THAT HE WAS COMMENCING THE ASSIGNED CLB. THE EMBRAER AT 2100 FT CONVERGED WITH THE LEARJET AT 2500 FT AND SEPARATION WAS LOST. I HAD NO REASONABLE EXPECTATION THAT THESE 2 ACFT SHOULD EVER BE A FACTOR FOR ONE ANOTHER. FACILITY LOA'S AND SOP'S ARE CURRENTLY BEING REVIEWED AS A RESULT OF THIS EVENT.
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.