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DC9 crew checked in with ZOB controller assigned 12000 ft but read back 11000 ft to previous controller and conflicted with a C210 at 11000 ft.
| Attributes | |
| ACN | 557631 |
| Time | |
| Date | 200208 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : vwv.vor |
| State Reference | OH |
| Altitude | msl single value : 11000 |
| Environment | |
| Flight Conditions | IMC |
| Weather Elements | Rain Ice Thunderstorm |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | general aviation : personal |
| Make Model Name | Cessna 210 Centurion / Turbo Centurion 210C, 210D |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 16 |
| ASRS Report | 557631 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : required legal separation non adherence : published procedure |
| Independent Detector | atc equipment other atc equipment : radar other controllera other controllerb other flight crewa other flight crewb |
| Resolutory Action | flight crew : took evasive action |
| Miss Distance | horizontal : 9000 vertical : 800 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
DC9 descending northbound. Previous controller issued 12000 ft, pilot read back 11000 ft. Previous controller missed readback error. Upon checking on my frequency, I missed incorrect altitude assignment.
Original NASA ASRS Text
Title: DC9 CREW CHKED IN WITH ZOB CTLR ASSIGNED 12000 FT BUT READ BACK 11000 FT TO PREVIOUS CTLR AND CONFLICTED WITH A C210 AT 11000 FT.
Narrative: DC9 DSNDING NBOUND. PREVIOUS CTLR ISSUED 12000 FT, PLT READ BACK 11000 FT. PREVIOUS CTLR MISSED READBACK ERROR. UPON CHKING ON MY FREQ, I MISSED INCORRECT ALT ASSIGNMENT.
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.