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ZBW controller experienced operational error at FL350 between climbing and level traffic; conflict alert activated but corrective action by controller was too late.
| Attributes | |
| ACN | 791535 |
| Time | |
| Date | 200806 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : hto.vortac |
| State Reference | NY |
| Altitude | msl single value : 35000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zbw.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zbw.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B767 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| ASRS Report | 791535 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | controller : issued alert controller : issued new clearance |
| Miss Distance | horizontal : 18600 vertical : 100 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft X was climbing out of FL290 to FL360 moving west then turning south. Aircraft Y was heading east at FL350. As aircraft X completed his turn; conflict alert went off. Aircraft X was at FL344. When conflict alert went off I only had 31 seconds and separation was lost. Issued turns to aircraft X and descent. No answer. I issued turns and descent. Again aircraft X responded. Also turned aircraft Y; but was too late to save error. I believe the frequency could have also been a factor. It was not our normal frequency and I was having to repeat myself twice for every clearance.
Original NASA ASRS Text
Title: ZBW CTLR EXPERIENCED OPERROR AT FL350 BETWEEN CLIMBING AND LEVEL TFC; CONFLICT ALERT ACTIVATED BUT CORRECTIVE ACTION BY CTLR WAS TOO LATE.
Narrative: ACFT X WAS CLBING OUT OF FL290 TO FL360 MOVING W THEN TURNING S. ACFT Y WAS HEADING E AT FL350. AS ACFT X COMPLETED HIS TURN; CONFLICT ALERT WENT OFF. ACFT X WAS AT FL344. WHEN CONFLICT ALERT WENT OFF I ONLY HAD 31 SECONDS AND SEPARATION WAS LOST. ISSUED TURNS TO ACFT X AND DSCNT. NO ANSWER. I ISSUED TURNS AND DSCNT. AGAIN ACFT X RESPONDED. ALSO TURNED ACFT Y; BUT WAS TOO LATE TO SAVE ERROR. I BELIEVE THE FREQ COULD HAVE ALSO BEEN A FACTOR. IT WAS NOT OUR NORMAL FREQ AND I WAS HAVING TO REPEAT MYSELF TWICE FOR EVERY CLRNC.
Data retrieved from NASA's ASRS site as of May 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.