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ZOB controller experienced operational error with climbing and descending aircraft when altitude clearance was misspoken.
| Attributes | |
| ACN | 623917 |
| Time | |
| Date | 200407 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : mgw.vortac |
| State Reference | WV |
| Altitude | msl bound lower : 26000 msl bound upper : 27000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | general aviation : corporate |
| Make Model Name | Citation X |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller military : 1 controller radar : 29 controller time certified in position1 : 12 |
| ASRS Report | 623917 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert |
| Resolutory Action | controller : issued alert controller : issued new clearance flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 16800 vertical : 300 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I believe I cleared my departure aircraft to FL260 as my data block indicated. For some unknown reason, I misspoke FL260 as FL280. The aircraft climbed to FL280 while deviating east for WX. The aircraft climbed through the altitude I believed I had assigned and was in conflict with descending traffic.
Original NASA ASRS Text
Title: ZOB CTLR EXPERIENCED OPERROR WITH CLBING AND DSNDING ACFT WHEN ALT CLRNC WAS MISSPOKEN.
Narrative: I BELIEVE I CLRED MY DEP ACFT TO FL260 AS MY DATA BLOCK INDICATED. FOR SOME UNKNOWN REASON, I MISSPOKE FL260 AS FL280. THE ACFT CLBED TO FL280 WHILE DEVIATING E FOR WX. THE ACFT CLBED THROUGH THE ALT I BELIEVED I HAD ASSIGNED AND WAS IN CONFLICT WITH DSNDING TFC.
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.