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ZID control action insufficient to maintain legal separation between a B757 and LJ24 while encountering turbulence.
| Attributes | |
| ACN | 537330 |
| Time | |
| Date | 200202 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : cvg.airport |
| State Reference | KY |
| Altitude | msl single value : 29000 |
| Environment | |
| Weather Elements | Turbulence |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : level |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air taxi |
| Make Model Name | Learjet 24 |
| Operating Under FAR Part | Part 135 |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Function | controller : radar instruction : trainee |
| Qualification | controller : developmental |
| Experience | controller military : 9 controller radar : 1 |
| ASRS Report | 537330 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne less severe inflight encounter : turbulence inflight encounter : weather non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert atc equipment other atc equipment : radar other controllera |
| Resolutory Action | controller : issued new clearance |
| Consequence | other |
| Miss Distance | horizontal : 20400 vertical : 1500 |
| Supplementary | |
| Problem Areas | ATC Human Performance Weather Aircraft |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft Y was descended to FL290 and turned to 270 degrees to allow for the required 20 NM spacing into dtw area. Aircraft X was heading 280 degrees. The LR24 (aircraft Y) was faster and slower to turn. Aircraft X was descended, but horizontal and vertical separation was not maintained.
Original NASA ASRS Text
Title: ZID CTL ACTION INSUFFICIENT TO MAINTAIN LEGAL SEPARATION BTWN A B757 AND LJ24 WHILE ENCOUNTERING TURB.
Narrative: ACFT Y WAS DSNDED TO FL290 AND TURNED TO 270 DEGS TO ALLOW FOR THE REQUIRED 20 NM SPACING INTO DTW AREA. ACFT X WAS HDG 280 DEGS. THE LR24 (ACFT Y) WAS FASTER AND SLOWER TO TURN. ACFT X WAS DSNDED, BUT HORIZ AND VERT SEPARATION WAS NOT MAINTAINED.
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.