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ZOB controller experienced operational error at 12000 when incorrect altitude assignment readback was missed by controller and separation was lost.
| Attributes | |
| ACN | 743068 |
| Time | |
| Date | 200706 |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : cvg.airport |
| State Reference | OH |
| Altitude | msl single value : 12000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dawn |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | general aviation : corporate |
| Make Model Name | Learjet 35 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | DC-8 70 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 25 |
| ASRS Report | 743068 |
| Person 2 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | altitude deviation : overshoot conflict : airborne less severe non adherence : clearance non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | controller : issued alert controller : issued new clearance |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 18000 vertical : 100 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
The lear was issued clearance to cross 40 mi east of cvg at 14000 ft. The pilot read back 40 mi east of cvg at 11000 ft. The lear descended below 14000 ft into the airspace of the DC87; which was climbing to 13000 ft. The controller was unaware the lear had read back the altitude clearance incorrectly.
Original NASA ASRS Text
Title: ZOB CTLR EXPERIENCED OPERROR AT 12000 WHEN INCORRECT ALT ASSIGNMENT READBACK WAS MISSED BY CTLR AND SEPARATION WAS LOST.
Narrative: THE LEAR WAS ISSUED CLRNC TO CROSS 40 MI E OF CVG AT 14000 FT. THE PLT READ BACK 40 MI E OF CVG AT 11000 FT. THE LEAR DSNDED BELOW 14000 FT INTO THE AIRSPACE OF THE DC87; WHICH WAS CLBING TO 13000 FT. THE CTLR WAS UNAWARE THE LEAR HAD READ BACK THE ALT CLRNC INCORRECTLY.
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.