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ZOB controller described loss of separation event when C340 descended below assigned altitude; conflicting with opposite direction traffic at 11000.
| Attributes | |
| ACN | 797339 |
| Time | |
| Date | 200807 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : buf.vortac |
| State Reference | NY |
| Altitude | msl bound lower : 10600 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob.artcc tower : zzz.tower |
| Operator | general aviation : personal |
| Make Model Name | Cessna 340/340A |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : approach |
| 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 : 10 |
| ASRS Report | 797339 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | controller : issued new clearance controller : issued alert |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 24000 vertical : 400 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
At the buf sector; cleveland ARTCC aircraft X was coming from toronto center en route to roc; descend from 130 to 110. Aircraft Y (C210/G) was en route from roc to gau. I noticed aircraft X altitude indicate 106 and as I was about to question it. Aircraft X transmitted that he had accidentally descended through his assigned altitude and was correcting. Aircraft Y was tail to tail at the time but close enough to activate the conflict alert.
Original NASA ASRS Text
Title: ZOB CTLR DESCRIBED LOSS OF SEPARATION EVENT WHEN C340 DESCENDED BELOW ASSIGNED ALT; CONFLICTING WITH OPPOSITE DIRECTION TFC AT 11000.
Narrative: AT THE BUF SECTOR; CLEVELAND ARTCC ACFT X WAS COMING FROM TORONTO CTR ENRTE TO ROC; DSND FROM 130 TO 110. ACFT Y (C210/G) WAS ENRTE FROM ROC TO GAU. I NOTICED ACFT X ALT INDICATE 106 AND AS I WAS ABOUT TO QUESTION IT. ACFT X XMITTED THAT HE HAD ACCIDENTALLY DSNDED THROUGH HIS ASSIGNED ALT AND WAS CORRECTING. ACFT Y WAS TAIL TO TAIL AT THE TIME BUT CLOSE ENOUGH TO ACTIVATE THE CONFLICT ALERT.
Data retrieved from NASA's ASRS site as of May 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.