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ARTCC radar controller misjudges lateral spacing needed when climbing an aircraft in front and through the altitude of another air carrier aircraft at cruise altitude. Recognizing insufficient lateral distance, the controller issued turns, but was unable to maintain legal separation.
| Attributes | |
| ACN | 411759 |
| Time | |
| Date | 199808 |
| Day | Tue |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : bvt |
| State Reference | IN |
| Altitude | msl bound lower : 31000 msl bound upper : 31000 |
| Environment | |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau |
| 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 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | flight time total : 14 |
| ASRS Report | 411759 |
| 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 | none taken : insufficient time |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 26250 vertical : 0 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I was working the bvt high sector at ZAU when I climbed aircraft X through aircraft Y. I felt that I would have appropriate lateral separation, except aircraft X was drifting east of the centerline of J89, northwest of bvt. I turned aircraft X to a 170 degree heading. When that did not appear to work, I turned aircraft Y 20 degrees right. The aircraft appeared to pass within 4.5 to 5 mi laterally.
Original NASA ASRS Text
Title: ARTCC RADAR CTLR MISJUDGES LATERAL SPACING NEEDED WHEN CLBING AN ACFT IN FRONT AND THROUGH THE ALT OF ANOTHER ACR ACFT AT CRUISE ALT. RECOGNIZING INSUFFICIENT LATERAL DISTANCE, THE CTLR ISSUED TURNS, BUT WAS UNABLE TO MAINTAIN LEGAL SEPARATION.
Narrative: I WAS WORKING THE BVT HIGH SECTOR AT ZAU WHEN I CLBED ACFT X THROUGH ACFT Y. I FELT THAT I WOULD HAVE APPROPRIATE LATERAL SEPARATION, EXCEPT ACFT X WAS DRIFTING E OF THE CTRLINE OF J89, NW OF BVT. I TURNED ACFT X TO A 170 DEG HDG. WHEN THAT DID NOT APPEAR TO WORK, I TURNED ACFT Y 20 DEGS R. THE ACFT APPEARED TO PASS WITHIN 4.5 TO 5 MI LATERALLY.
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.