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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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ZOB instructor and trainee miss incorrect aircraft altitude readback which results in a loss of separation.
| Attributes | |
| ACN | 528463 |
| Time | |
| Date | 200110 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | intersection : mizar |
| State Reference | MI |
| Altitude | msl bound lower : 12000 msl bound upper : 13000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | BAe 146 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | SF 340B |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar instruction : trainee |
| Qualification | controller : developmental pilot : private |
| Experience | controller military : 4 controller radar : 3 flight time total : 70 |
| ASRS Report | 528463 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar instruction : instructor |
| Qualification | controller : radar |
| Experience | controller radar : 17 |
| ASRS Report | 528462 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : published procedure |
| Independent Detector | atc equipment : conflict alert |
| Resolutory Action | none taken : detected after the fact |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 23400 vertical : 500 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier Y was issued 11000 ft. Air carrier X took this clearance and descended from the assigned altitude of 13000 ft. I missed this readback and the error wasn't caught until separation was lost. 13000 ft was reissued to air carrier Y.
Original NASA ASRS Text
Title: ZOB INSTRUCTOR AND TRAINEE MISS INCORRECT ACFT ALT READBACK WHICH RESULTS IN A LOSS OF SEPARATION.
Narrative: ACR Y WAS ISSUED 11000 FT. ACR X TOOK THIS CLRNC AND DSNDED FROM THE ASSIGNED ALT OF 13000 FT. I MISSED THIS READBACK AND THE ERROR WASN'T CAUGHT UNTIL SEPARATION WAS LOST. 13000 FT WAS REISSUED TO ACR Y.
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.