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Air carrier Y non adherence to ATC clearance (excursion from assigned altitude) had less than standard separation from air carrier X.
| Attributes | |
| ACN | 156581 |
| Time | |
| Date | 199009 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : blf |
| State Reference | WV |
| Altitude | msl bound lower : 26500 msl bound upper : 28000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid tower : sfo |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other 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 | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : non radar |
| Qualification | controller : non radar controller : developmental |
| Experience | controller non radar : 1 |
| ASRS Report | 156581 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Events | |
| Anomaly | conflict : airborne less severe inflight encounter : weather non adherence : clearance non adherence : published procedure non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 18000 vertical : 500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error Pilot Deviation |
Narrative:
I was working the manual position at bkw hi sector ZID ARTCC. Air carrier X was a southbound flight deviating west for thunderstorms at FL280. Air carrier Y northbound was also at FL280. Air carrier X was descended to FL270. Air carrier Y data block indicated that he was descending and turning. In the meantime air carrier X was turned to 330 degree and descended to FL240. Air carrier Y data block showed FL265 so air carrier X was climbed to FL280 on a 270 degree heading sep was lost.
Original NASA ASRS Text
Title: ACR Y NON ADHERENCE TO ATC CLRNC (EXCURSION FROM ASSIGNED ALT) HAD LESS THAN STANDARD SEPARATION FROM ACR X.
Narrative: I WAS WORKING THE MANUAL POS AT BKW HI SECTOR ZID ARTCC. ACR X WAS A SBND FLT DEVIATING W FOR TSTMS AT FL280. ACR Y NBND WAS ALSO AT FL280. ACR X WAS DSNDED TO FL270. ACR Y DATA BLOCK INDICATED THAT HE WAS DSNDING AND TURNING. IN THE MEANTIME ACR X WAS TURNED TO 330 DEG AND DSNDED TO FL240. ACR Y DATA BLOCK SHOWED FL265 SO ACR X WAS CLBED TO FL280 ON A 270 DEG HDG SEP 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.