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ARTCC radar controller having been given control of an FK10 F0R descent in adjacent sector's airspace started the aircraft down through another aircraft's altitude, a DC9 at FL290 and opposite direction traffic. The adjacent radar controller saw the potential conflict and warned the other controller and both controllers turned their traffic, but less than standard separation occurred.
| Attributes | |
| ACN | 343053 |
| Time | |
| Date | 199608 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : crl |
| State Reference | MI |
| Altitude | msl bound lower : 29000 msl bound upper : 30000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob |
| Operator | common carrier : air carrier |
| Make Model Name | Fokker 100 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller non radar : 7 controller radar : 4 |
| ASRS Report | 343053 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 15000 vertical : 1000 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Radar and radar associate staffed the ZOB-det sector. Workload and complexity were average for the sector. Aircraft #1, air carrier X was nwbound on J-34 approximately 20 mi southeast of crl VORTAC, handed off to det sector but still in sky sector airspace. Aircraft #2, air carrier Y was sebound on J-34 approximately 20 mi northwest of crl, handed off and switched to sky sector but still in det sector airspace. Air carrier X was inbound to grand rapids and needed to start down soon due to proximity of the field and other traffic that would otherwise become a factor. Sky sector granted control for descent of air carrier X to the det sector associate controller, who informed the det radar controller. Air carrier X was issued clearance to FL240 and air carrier Y (opposite direction) was overlooked as traffic. After realizing that det sector was not providing adequate separation, the sky-right controller questioned det-right. Both controllers turned their respective aircraft left. Additionally, air carrier X was told to stop descent at FL300. Separation was lost with 1000 ft vertical and 2.4 mi lateral. The det radar controller may have overlooked the immediate traffic in an effort to resolve secondary and tertiary conflicts.
Original NASA ASRS Text
Title: ARTCC RADAR CTLR HAVING BEEN GIVEN CTL OF AN FK10 F0R DSCNT IN ADJACENT SECTOR'S AIRSPACE STARTED THE ACFT DOWN THROUGH ANOTHER ACFT'S ALT, A DC9 AT FL290 AND OPPOSITE DIRECTION TFC. THE ADJACENT RADAR CTLR SAW THE POTENTIAL CONFLICT AND WARNED THE OTHER CTLR AND BOTH CTLRS TURNED THEIR TFC, BUT LTSS OCCURRED.
Narrative: RADAR AND RADAR ASSOCIATE STAFFED THE ZOB-DET SECTOR. WORKLOAD AND COMPLEXITY WERE AVERAGE FOR THE SECTOR. ACFT #1, ACR X WAS NWBOUND ON J-34 APPROX 20 MI SE OF CRL VORTAC, HANDED OFF TO DET SECTOR BUT STILL IN SKY SECTOR AIRSPACE. ACFT #2, ACR Y WAS SEBOUND ON J-34 APPROX 20 MI NW OF CRL, HANDED OFF AND SWITCHED TO SKY SECTOR BUT STILL IN DET SECTOR AIRSPACE. ACR X WAS INBOUND TO GRAND RAPIDS AND NEEDED TO START DOWN SOON DUE TO PROX OF THE FIELD AND OTHER TFC THAT WOULD OTHERWISE BECOME A FACTOR. SKY SECTOR GRANTED CTL FOR DSCNT OF ACR X TO THE DET SECTOR ASSOCIATE CTLR, WHO INFORMED THE DET RADAR CTLR. ACR X WAS ISSUED CLRNC TO FL240 AND ACR Y (OPPOSITE DIRECTION) WAS OVERLOOKED AS TFC. AFTER REALIZING THAT DET SECTOR WAS NOT PROVIDING ADEQUATE SEPARATION, THE SKY-R CTLR QUESTIONED DET-R. BOTH CTLRS TURNED THEIR RESPECTIVE ACFT L. ADDITIONALLY, ACR X WAS TOLD TO STOP DSCNT AT FL300. SEPARATION WAS LOST WITH 1000 FT VERT AND 2.4 MI LATERAL. THE DET RADAR CTLR MAY HAVE OVERLOOKED THE IMMEDIATE TFC IN AN EFFORT TO RESOLVE SECONDARY AND TERTIARY CONFLICTS.
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.