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ARTCC radar controller issued wrong heading to an aircraft to provide separation. The heading turned the aircraft into the other aircraft which resulted in less than standard separation.
| Attributes | |
| ACN | 160905 |
| Time | |
| Date | 199010 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : ecb |
| State Reference | KY |
| Altitude | msl bound lower : 35000 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | Marginal |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid artcc : zob |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 5 |
| ASRS Report | 160905 |
| 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 | atc equipment other atc equipment : unspecified |
| Resolutory Action | controller : issued new clearance other |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 21000 vertical : 0 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Medium large transport X was westbound at FL350. Aircraft was 10 mi north of another large transport Y flight also westbound at FL350. Both aircraft were on assigned headings to parallel each other. Medium large transport Z was about 50 mi south of these 2 aircraft nwbnd at FL350. Medium large transport Z was going to be in conflict with both westbound aircraft at FL350. The first aircraft (large transport Y on south side) called on my frequency. I turned the aircraft 15 degrees left to go behind medium large transport Z. Large transport Y turned and advised me his heading would be 240 degrees. When medium large transport X called on my frequency, I intended to also turn him to a 240 degree heading, but inadvertently said 340 degrees. The medium large transport X read back 340 degrees and turned right and became a factor with a southbound large transport a at FL350. I idented the error and turned medium large transport X left to 260 degrees, but not in time to prevent an operational error.
Original NASA ASRS Text
Title: ARTCC RADAR CTLR ISSUED WRONG HEADING TO AN ACFT TO PROVIDE SEPARATION. THE HEADING TURNED THE ACFT INTO THE OTHER ACFT WHICH RESULTED IN LESS THAN STANDARD SEPARATION.
Narrative: MLG X WAS WBND AT FL350. ACFT WAS 10 MI N OF ANOTHER LGT Y FLT ALSO WBND AT FL350. BOTH ACFT WERE ON ASSIGNED HDGS TO PARALLEL EACH OTHER. MLG Z WAS ABOUT 50 MI S OF THESE 2 ACFT NWBND AT FL350. MLG Z WAS GOING TO BE IN CONFLICT WITH BOTH WBND ACFT AT FL350. THE FIRST ACFT (LGT Y ON S SIDE) CALLED ON MY FREQ. I TURNED THE ACFT 15 DEGS LEFT TO GO BEHIND MLG Z. LGT Y TURNED AND ADVISED ME HIS HDG WOULD BE 240 DEGS. WHEN MLG X CALLED ON MY FREQ, I INTENDED TO ALSO TURN HIM TO A 240 DEG HDG, BUT INADVERTENTLY SAID 340 DEGS. THE MLG X READ BACK 340 DEGS AND TURNED RIGHT AND BECAME A FACTOR WITH A SBND LGT A AT FL350. I IDENTED THE ERROR AND TURNED MLG X LEFT TO 260 DEGS, BUT NOT IN TIME TO PREVENT AN OPERROR.
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.