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Controller attempted to separate aircraft at level flight, however control instructions were not sufficicent enough to prevent loss of separation. Operational error.
| Attributes | |
| ACN | 102978 |
| Time | |
| Date | 198901 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : chs |
| State Reference | SC |
| Altitude | msl bound lower : 33000 msl bound upper : 33000 |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zjx |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 3 |
| ASRS Report | 102978 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 27000 vertical : 1500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I noticed a potential loss of separation between large transport X and large transport Y. I thought I gave a turn 30 degree left to large transport X. This did not seem to work so I reissued the turn to large transport X and also turned and descended large transport Y. At this time it is in doubt whether the initial turn was to the left or right, and due to this the separation may have been lost.
Original NASA ASRS Text
Title: CTLR ATTEMPTED TO SEPARATE ACFT AT LEVEL FLT, HOWEVER CTL INSTRUCTIONS WERE NOT SUFFICICENT ENOUGH TO PREVENT LOSS OF SEPARATION. OPERATIONAL ERROR.
Narrative: I NOTICED A POTENTIAL LOSS OF SEPARATION BTWN LGT X AND LGT Y. I THOUGHT I GAVE A TURN 30 DEG L TO LGT X. THIS DID NOT SEEM TO WORK SO I REISSUED THE TURN TO LGT X AND ALSO TURNED AND DSNDED LGT Y. AT THIS TIME IT IS IN DOUBT WHETHER THE INITIAL TURN WAS TO THE L OR R, AND DUE TO THIS THE SEPARATION MAY HAVE BEEN LOST.
Data retrieved from NASA's ASRS site as of August 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.