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ARTCC radar controller failed to provide standard IFR separation between two aircraft under his control.
| Attributes | |
| ACN | 142693 |
| Time | |
| Date | 199004 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : lfk |
| State Reference | TX |
| Altitude | msl bound lower : 19000 msl bound upper : 19000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zhu tower : dfw |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller non radar : 2 controller radar : 11 |
| ASRS Report | 142693 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : handoff position |
| Qualification | controller : radar |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 5600 vertical : 600 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Medium large transport X came on frequency. Radio controller had no knowledge of medium large transport X's location. Radar controller got medium large transport X's position, located departure strip and attempted to start a track on medium large transport X. At that time manual controller pointed to medium large transport X's limited data block and said start a track. Radar controller's attention was diverted to another area of radar pvd. Several mins after the conflict alert was activated between medium large transport X and medium large transport Y at FL330. At that time radar controller asked the manual controller where the medium large transport X had come from as the initial action to start a track on medium large transport X had failed. Medium large transport X had been leveled at FL190 due to over traffic at FL200. Medium large transport Z also on the same route as medium large transport X and was in front of medium large transport X at FL190. The conflict alert was activated between medium large transport Z and medium large transport X. Medium large transport X was vectored 40 degree to the right and descended to FL180.
Original NASA ASRS Text
Title: ARTCC RADAR CTLR FAILED TO PROVIDE STANDARD IFR SEPARATION BETWEEN TWO ACFT UNDER HIS CTL.
Narrative: MLG X CAME ON FREQ. RADIO CTLR HAD NO KNOWLEDGE OF MLG X'S LOCATION. RADAR CTLR GOT MLG X'S POSITION, LOCATED DEP STRIP AND ATTEMPTED TO START A TRACK ON MLG X. AT THAT TIME MANUAL CTLR POINTED TO MLG X'S LIMITED DATA BLOCK AND SAID START A TRACK. RADAR CTLR'S ATTN WAS DIVERTED TO ANOTHER AREA OF RADAR PVD. SEVERAL MINS AFTER THE CONFLICT ALERT WAS ACTIVATED BETWEEN MLG X AND MLG Y AT FL330. AT THAT TIME RADAR CTLR ASKED THE MANUAL CTLR WHERE THE MLG X HAD COME FROM AS THE INITIAL ACTION TO START A TRACK ON MLG X HAD FAILED. MLG X HAD BEEN LEVELED AT FL190 DUE TO OVER TFC AT FL200. MLG Z ALSO ON THE SAME ROUTE AS MLG X AND WAS IN FRONT OF MLG X AT FL190. THE CONFLICT ALERT WAS ACTIVATED BETWEEN MLG Z AND MLG X. MLG X WAS VECTORED 40 DEG TO THE RIGHT AND DESCENDED TO FL180.
Data retrieved from NASA's ASRS site as of July 2007 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.