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Air carrier took descent clearance meant for another company aircraft and descended through an occupied altitude.
| Attributes | |
| ACN | 139940 |
| Time | |
| Date | 199003 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : msy |
| State Reference | LA |
| Altitude | msl bound lower : 22000 msl bound upper : 23000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zhu |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | cruise other cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| ASRS Report | 139940 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | non adherence : published procedure non adherence : clearance non adherence : required legal separation other anomaly other |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | Other |
| Miss Distance | horizontal : 12750 vertical : 600 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Pilot Deviation Operational Error |
Narrative:
I had an aircraft inbound to new orleans. Callsign air carrier abc. He was deviating for WX and he was at FL230. Air carrier X departure from new orleans is at FL220 (level). Both these aircraft were passing each other when air carrier abc requested lower altitude. I gave a descent clearance to air carrier azc (same company). I assigned him 17000'. Air carrier abc took the clearance and descended through the altitude of air carrier X.
Original NASA ASRS Text
Title: ACR TOOK DESCENT CLRNC MEANT FOR ANOTHER COMPANY ACFT AND DESCENDED THROUGH AN OCCUPIED ALT.
Narrative: I HAD AN ACFT INBND TO NEW ORLEANS. CALLSIGN ACR ABC. HE WAS DEVIATING FOR WX AND HE WAS AT FL230. ACR X DEP FROM NEW ORLEANS IS AT FL220 (LEVEL). BOTH THESE ACFT WERE PASSING EACH OTHER WHEN ACR ABC REQUESTED LOWER ALT. I GAVE A DSCNT CLRNC TO ACR AZC (SAME COMPANY). I ASSIGNED HIM 17000'. ACR ABC TOOK THE CLRNC AND DSNDED THROUGH THE ALT OF ACR X.
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.