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D10 controller experienced separation loss at 3500 ft when IFR aircraft responded to TCAS RA of a class B violator losing separation with another aircraft.
| Attributes | |
| ACN | 715599 |
| Time | |
| Date | 200610 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : d10.tracon |
| State Reference | TX |
| Altitude | msl single value : 3500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : d10.tracon |
| Operator | general aviation : corporate |
| Make Model Name | Citation X |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : d10.tracon |
| Make Model Name | Experimental |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller radar : 19 controller time certified in position1 : 12 |
| ASRS Report | 715599 |
| Person 2 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne critical non adherence : required legal separation |
| Independent Detector | aircraft equipment : tcas other controllera |
| Resolutory Action | flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 0 vertical : 100 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
I was working both aircraft. I had issued a descent clearance to aircraft X in order to get underneath aircraft Y. An unidented class B violator caused aircraft X's TCAS to issue an RA climb. Aircraft X climbed into aircraft Y. I issued aircraft Y a turn until visual separation was established.
Original NASA ASRS Text
Title: D10 CTLR EXPERIENCED SEPARATION LOSS AT 3500 FT WHEN IFR ACFT RESPONDED TO TCAS RA OF A CLASS B VIOLATOR LOSING SEPARATION WITH ANOTHER ACFT.
Narrative: I WAS WORKING BOTH ACFT. I HAD ISSUED A DSCNT CLRNC TO ACFT X IN ORDER TO GET UNDERNEATH ACFT Y. AN UNIDENTED CLASS B VIOLATOR CAUSED ACFT X'S TCAS TO ISSUE AN RA CLB. ACFT X CLBED INTO ACFT Y. I ISSUED ACFT Y A TURN UNTIL VISUAL SEPARATION WAS ESTABLISHED.
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.