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Reporter failed to catch wrong readback altitude given by aircraft X. Loss of standard separation resulted with aircraft Y.
| Attributes | |
| ACN | 447403 |
| Time | |
| Date | 199908 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : djb.vortac |
| State Reference | OH |
| Altitude | msl single value : 22000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | general aviation : personal |
| Make Model Name | Learjet 55 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | general aviation : personal |
| Make Model Name | Beechjet 400 |
| 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 : 9 flight time total : 90 |
| ASRS Report | 447403 |
| Person 2 | |
| Affiliation | other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : overshoot conflict : airborne less severe non adherence : clearance non adherence : required legal separation other anomaly other |
| Independent Detector | atc equipment other atc equipment : error detection other controllera |
| Resolutory Action | none taken : insufficient time |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 27750 vertical : 100 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I descended aircraft X to FL230 and pilot read back FL220. I thought I heard FL230 so I switched aircraft X to next sector. The next sector missed hearing the pilot state that he was descending out of FL225. Error occurred because receiving controller had aircraft Y traffic at FL220. I was not aware of situation occurring at my sector.
Original NASA ASRS Text
Title: RPTR FAILED TO CATCH WRONG READBACK ALT GIVEN BY ACFT X. LOSS OF STANDARD SEPARATION RESULTED WITH ACFT Y.
Narrative: I DSNDED ACFT X TO FL230 AND PLT READ BACK FL220. I THOUGHT I HEARD FL230 SO I SWITCHED ACFT X TO NEXT SECTOR. THE NEXT SECTOR MISSED HEARING THE PLT STATE THAT HE WAS DSNDING OUT OF FL225. ERROR OCCURRED BECAUSE RECEIVING CTLR HAD ACFT Y TFC AT FL220. I WAS NOT AWARE OF SIT OCCURRING AT MY SECTOR.
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.