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Aircraft X descent through occupied altitude, had less than standard separation from air carrier Y. System error. Potential conflict less than standard separation.
| Attributes | |
| ACN | 297345 |
| Time | |
| Date | 199502 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : any |
| State Reference | KS |
| Altitude | msl bound lower : 28000 msl bound upper : 28000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zkc artcc : zid |
| Make Model Name | Turbo (Jet) Prop |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller military : 4 controller radar : 25 |
| ASRS Report | 297345 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 23400 vertical : 800 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier Y, B737, swbound from stl to phx at FL280. Aircraft X sebound from cos to rog at FL290. 30 mi southeast of the any VOR, X asked to descend to FL270. X was cleared to FL270. In doing so, X passed 800 ft above and 3.9 mi behind Y. The judgement factor was critical. Better judgement should have been used.
Original NASA ASRS Text
Title: ACFT X DSCNT THROUGH OCCUPIED ALT, HAD LTSS FROM ACR Y. SYS ERROR. POTENTIAL CONFLICT LTSS.
Narrative: ACR Y, B737, SWBOUND FROM STL TO PHX AT FL280. ACFT X SEBOUND FROM COS TO ROG AT FL290. 30 MI SE OF THE ANY VOR, X ASKED TO DSND TO FL270. X WAS CLRED TO FL270. IN DOING SO, X PASSED 800 FT ABOVE AND 3.9 MI BEHIND Y. THE JUDGEMENT FACTOR WAS CRITICAL. BETTER JUDGEMENT SHOULD HAVE BEEN USED.
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.