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Loss of separation occurred when a B737, diverting around WX, turned unexpectedly and conflicted with a descending air carrier.
| Attributes | |
| ACN | 594984 |
| Time | |
| Date | 200308 |
| Day | Sat |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | navaid : tth.vortac |
| State Reference | IN |
| Altitude | msl single value : 31000 |
| Environment | |
| Flight Conditions | IMC |
| Weather Elements | Thunderstorm |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : enroute altitude change |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : supervisor controller : radar |
| Qualification | controller : radar |
| Experience | controller military : 9 controller radar : 10 controller time certified in position1 : 2 |
| ASRS Report | 594984 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne critical inflight encounter : weather non adherence : required legal separation non adherence : published procedure other spatial deviation |
| Independent Detector | atc equipment other atc equipment : radar/mode c other controllera other flight crewa other flight crewb |
| Resolutory Action | none taken : anomaly accepted none taken : detected after the fact |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 26400 vertical : 200 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft Y was descending for WX. Aircraft X was descending. Aircraft Y turned back on course and separation was lost.
Original NASA ASRS Text
Title: LOSS OF SEPARATION OCCURRED WHEN A B737, DIVERTING AROUND WX, TURNED UNEXPECTEDLY AND CONFLICTED WITH A DSNDING ACR.
Narrative: ACFT Y WAS DSNDING FOR WX. ACFT X WAS DSNDING. ACFT Y TURNED BACK ON COURSE AND SEPARATION WAS LOST.
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.