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2 acrs on conflicting courses were radar vectored, but the turns were insufficient to prevent less than standard separation.
| Attributes | |
| ACN | 123044 |
| Time | |
| Date | 198909 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : azq |
| State Reference | KY |
| Altitude | msl bound lower : 31900 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid tower : bfi |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : developmental |
| Experience | controller non radar : 1 controller radar : 1 |
| ASRS Report | 123044 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance |
| Consequence | Other |
| Miss Distance | horizontal : 24300 vertical : 1100 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X was descended to FL350, then was turned 15 degrees left and cleared to FL290 to comply with the ZID and ZTL LOA for control arrs. Air carrier Y was turned 10 degrees left for traffic to stay behind air carrier X. Air carrier X was told to expedite through FL310. Additional turns were issued to both aircraft to maintain sep. The turns were too late to establish latitude sep when vertical was lost.
Original NASA ASRS Text
Title: 2 ACRS ON CONFLICTING COURSES WERE RADAR VECTORED, BUT THE TURNS WERE INSUFFICIENT TO PREVENT LESS THAN STANDARD SEPARATION.
Narrative: ACR X WAS DSNDED TO FL350, THEN WAS TURNED 15 DEGS LEFT AND CLRED TO FL290 TO COMPLY WITH THE ZID AND ZTL LOA FOR CTL ARRS. ACR Y WAS TURNED 10 DEGS LEFT FOR TFC TO STAY BEHIND ACR X. ACR X WAS TOLD TO EXPEDITE THROUGH FL310. ADDITIONAL TURNS WERE ISSUED TO BOTH ACFT TO MAINTAIN SEP. THE TURNS WERE TOO LATE TO ESTABLISH LAT SEP WHEN VERT WAS LOST.
Data retrieved from NASA's ASRS site as of August 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.