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A ZOB ARTCC radar controller relieves a sector and is not briefed that an aircraft in the sector was suppressed to a limited target. A conflict occurred resulting in an operational error.
| Attributes | |
| ACN | 630558 |
| Time | |
| Date | 200409 |
| Day | Fri |
| Place | |
| Locale Reference | navaid : crl.vortac |
| State Reference | MI |
| Altitude | msl single value : 23000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller military : 6 controller radar : 20 |
| ASRS Report | 630558 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert atc equipment other atc equipment : radar/mode c |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 24000 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I was working aircraft X after accepting the sector from another controller. When I sat down the conflict alert activated on aircraft X, another aircraft. I asked the controller I had relieved if they had pointed out aircraft X to tol sector (which is the sector that had the other aircraft in it). When the controller I had relieved verified this, I suppressed the conflict alert. A few mins later the controller at det sector called me and asked if I was working aircraft X and then asked if I was turning him. I said for what and he said for the jet link. At that time I saw the limited target at FL230 and that the 2 aircraft were going to pass abeam and 4 mi or so, so I asked aircraft X to expedite his climb.
Original NASA ASRS Text
Title: A ZOB ARTCC RADAR CTLR RELIEVES A SECTOR AND IS NOT BRIEFED THAT AN ACFT IN THE SECTOR WAS SUPPRESSED TO A LIMITED TARGET. A CONFLICT OCCURRED RESULTING IN AN OPERROR.
Narrative: I WAS WORKING ACFT X AFTER ACCEPTING THE SECTOR FROM ANOTHER CTLR. WHEN I SAT DOWN THE CONFLICT ALERT ACTIVATED ON ACFT X, ANOTHER ACFT. I ASKED THE CTLR I HAD RELIEVED IF THEY HAD POINTED OUT ACFT X TO TOL SECTOR (WHICH IS THE SECTOR THAT HAD THE OTHER ACFT IN IT). WHEN THE CTLR I HAD RELIEVED VERIFIED THIS, I SUPPRESSED THE CONFLICT ALERT. A FEW MINS LATER THE CTLR AT DET SECTOR CALLED ME AND ASKED IF I WAS WORKING ACFT X AND THEN ASKED IF I WAS TURNING HIM. I SAID FOR WHAT AND HE SAID FOR THE JET LINK. AT THAT TIME I SAW THE LIMITED TARGET AT FL230 AND THAT THE 2 ACFT WERE GOING TO PASS ABEAM AND 4 MI OR SO, SO I ASKED ACFT X TO EXPEDITE HIS CLB.
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.