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ZID controller experienced operational error at approximately FL410 as incorrect descent clearance was issued.
| Attributes | |
| ACN | 646122 |
| Time | |
| Date | 200502 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | navaid : gzg.vor |
| State Reference | VA |
| Altitude | msl bound lower : 41000 msl bound upper : 42000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | general aviation : corporate |
| Make Model Name | Learjet 60 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : developmental |
| Experience | controller radar : 9 |
| ASRS Report | 646122 |
| Person 2 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 24000 vertical : 1000 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
LR60 at FL430; descended to FL420 (mistook altitude for an rvsm altitude) on top of B737 at FL410.
Original NASA ASRS Text
Title: ZID CTLR EXPERIENCED OPERROR AT APPROX FL410 AS INCORRECT DSCNT CLRNC WAS ISSUED.
Narrative: LR60 AT FL430; DSNDED TO FL420 (MISTOOK ALT FOR AN RVSM ALT) ON TOP OF B737 AT FL410.
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.