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ZOB controller experienced operational error at FL340 when turns issued to avoid traffic were not acknowledged and separation was lost.
| Attributes | |
| ACN | 675414 |
| Time | |
| Date | 200510 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | navaid : dkk.vor |
| State Reference | NY |
| Altitude | msl single value : 34000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | EMB ERJ 170/175 ER&LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : vacating altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 17 controller time certified in position1 : 15 |
| ASRS Report | 675414 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| 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 |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 26400 vertical : 100 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I just took over a busy sector. I had been briefed that I would be receiving air carrier V at FL350; who was going to be in conflict with air carrier X at FL350. Air carrier X also had an aircraft Z underneath at FL330 who was slowly descending; and an opposite direction aircraft west at FL340; about 3 mins away. Unnoticed was air carrier Y; also at FL340. Air carrier Y was nwbound at heading 300 degrees; and air carrier X was eastbound at heading 090 degrees. When the descending FL330 aircraft was out of the way; air carrier X was hurried down to FL330. Air carrier Y was brought to my attention by the relieved controller; and turns of 25 degrees right were issued to air carrier X and air carrier Y. Air carrier X responded to both turns; however; and air carrier Y never received a turn.
Original NASA ASRS Text
Title: ZOB CTLR EXPERIENCED OPERROR AT FL340 WHEN TURNS ISSUED TO AVOID TFC WERE NOT ACKNOWLEDGED AND SEPARATION WAS LOST.
Narrative: I JUST TOOK OVER A BUSY SECTOR. I HAD BEEN BRIEFED THAT I WOULD BE RECEIVING ACR V AT FL350; WHO WAS GOING TO BE IN CONFLICT WITH ACR X AT FL350. ACR X ALSO HAD AN ACFT Z UNDERNEATH AT FL330 WHO WAS SLOWLY DSNDING; AND AN OPPOSITE DIRECTION ACFT W AT FL340; ABOUT 3 MINS AWAY. UNNOTICED WAS ACR Y; ALSO AT FL340. ACR Y WAS NWBOUND AT HDG 300 DEGS; AND ACR X WAS EBOUND AT HDG 090 DEGS. WHEN THE DSNDING FL330 ACFT WAS OUT OF THE WAY; ACR X WAS HURRIED DOWN TO FL330. ACR Y WAS BROUGHT TO MY ATTN BY THE RELIEVED CTLR; AND TURNS OF 25 DEGS R WERE ISSUED TO ACR X AND ACR Y. ACR X RESPONDED TO BOTH TURNS; HOWEVER; AND ACR Y NEVER RECEIVED A TURN.
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.