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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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ZKC controller experienced operational error at approximately FL380 when issuing descent clearance with aircraft in close proximity.
| Attributes | |
| ACN | 661348 |
| Time | |
| Date | 200506 |
| Place | |
| Locale Reference | navaid : mcm.vor |
| State Reference | MO |
| Altitude | msl bound lower : 37000 msl bound upper : 38600 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zkc.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : enroute altitude change |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zkc.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 : radar |
| Experience | controller radar : 20 |
| ASRS Report | 661348 |
| Person 2 | |
| Affiliation | company : air carrier |
| 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 |
| Resolutory Action | controller : issued alert |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 20000 vertical : 600 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft #1 was at FL390 and issued a clearance to FL370. Aircraft #2 was 3 mi north of aircraft #1 at FL380. Aircraft #1 was eastbound. Aircraft #2 was wbound. I attempted to stop aircraft #1 at FL390; however; aircraft #1 had already descended and separation was lost.
Original NASA ASRS Text
Title: ZKC CTLR EXPERIENCED OPERROR AT APPROX FL380 WHEN ISSUING DSCNT CLRNC WITH ACFT IN CLOSE PROX.
Narrative: ACFT #1 WAS AT FL390 AND ISSUED A CLRNC TO FL370. ACFT #2 WAS 3 MI N OF ACFT #1 AT FL380. ACFT #1 WAS EBOUND. ACFT #2 WAS WBOUND. I ATTEMPTED TO STOP ACFT #1 AT FL390; HOWEVER; ACFT #1 HAD ALREADY DSNDED AND SEPARATION WAS LOST.
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.