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ZTL controller has an operational error at approximately FL260 when instructor fails to hear a conflicting descent clearance issued by the developmental controller.
| Attributes | |
| ACN | 646134 |
| Time | |
| Date | 200502 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : dbn.vortac |
| State Reference | GA |
| Altitude | msl bound lower : 26000 msl bound upper : 27000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : ztl.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : ztl.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar instruction : instructor |
| Qualification | controller : radar |
| Experience | controller radar : 18 |
| ASRS Report | 646134 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar instruction : trainee |
| Qualification | controller : developmental |
| ASRS Report | 646133 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera other controllerb other other : 3 |
| Resolutory Action | controller : issued alert |
| Miss Distance | horizontal : 26400 vertical : 400 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I was performing OJT. Air carrier X was descended to FL240. Air carrier Y was at FL260 opposite direction. Air carrier X was descending from FL410 and was not a factor. However; air carrier Z; who was 10 mi in trail of air carrier X; was at FL270 and was descended to FL240. I missed this clearance or thought it was air carrier X. Supplemental information from acn 646133: I was training on the radar position working overflts and arrs into atl. Air carrier Y was an overflt north to south; air carrier Z was an arrival to atl. Air carrier Y was at FL260; air carrier Z was at FL270. Air carrier Z was turned to husky then descended to FL240. Conflict alert did not activate until aircraft had passed.
Original NASA ASRS Text
Title: ZTL CTLR HAS AN OPERROR AT APPROX FL260 WHEN INSTRUCTOR FAILS TO HEAR A CONFLICTING DSCNT CLRNC ISSUED BY THE DEVELOPMENTAL CTLR.
Narrative: I WAS PERFORMING OJT. ACR X WAS DSNDED TO FL240. ACR Y WAS AT FL260 OPPOSITE DIRECTION. ACR X WAS DSNDING FROM FL410 AND WAS NOT A FACTOR. HOWEVER; ACR Z; WHO WAS 10 MI IN TRAIL OF ACR X; WAS AT FL270 AND WAS DSNDED TO FL240. I MISSED THIS CLRNC OR THOUGHT IT WAS ACR X. SUPPLEMENTAL INFO FROM ACN 646133: I WAS TRAINING ON THE RADAR POS WORKING OVERFLTS AND ARRS INTO ATL. ACR Y WAS AN OVERFLT N TO S; ACR Z WAS AN ARR TO ATL. ACR Y WAS AT FL260; ACR Z WAS AT FL270. ACR Z WAS TURNED TO HUSKY THEN DSNDED TO FL240. CONFLICT ALERT DID NOT ACTIVATE UNTIL ACFT HAD PASSED.
Data retrieved from NASA's ASRS site as of January 2009 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.