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ARTCC controller failed to maintain legal separation with a cessna citation descending from FL350 and crossing the flight path of a B737 at FL310.
| Attributes | |
| ACN | 471053 |
| Time | |
| Date | 200004 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| State Reference | KS |
| Altitude | msl bound lower : 32500 msl bound upper : 33000 |
| Environment | |
| Weather Elements | Thunderstorm |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zkc.artcc |
| Operator | general aviation : corporate |
| Make Model Name | Citation I |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : vacating altitude |
| 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 |
| Navigation In Use | other vortac |
| Flight Phase | cruise : level |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller military : 4 controller non radar : 5 controller radar : 25 flight time total : 20 |
| ASRS Report | 471053 |
| Person 2 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe inflight encounter : weather non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | controller : separated traffic controller : issued new clearance |
| Miss Distance | horizontal : 22500 vertical : 1500 |
| Supplementary | |
| Problem Areas | ATC Facility ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Cpr (sjc-ict) FL410 descending into ict. Air carrier B757 (msp-gag-bgd-tcc-abq-phx) FL310, 40 mi southwest scn direct gag. Crossing path of cpr. Conflict alert activated when cpr was descending from FL350. Cpr was instructed to maintain FL330. He responded that he would descend below FL330 before he could start to climb. Separation was lost at that time and the error occurred. I felt a number of things happened to contribute to the error. 1) a line of thunderstorms forced traffic into sector creating a complex traffic situation. 2) inexperienced assistant controller. 3) noise level immediate area. 4) no history on sector that evening. 5) poor lighting in area -- had to struggle to see keyboard. Solution: draw your own conclusion.
Original NASA ASRS Text
Title: ARTCC CTLR FAILED TO MAINTAIN LEGAL SEPARATION WITH A CESSNA CITATION DSNDING FROM FL350 AND XING THE FLT PATH OF A B737 AT FL310.
Narrative: CPR (SJC-ICT) FL410 DSNDING INTO ICT. ACR B757 (MSP-GAG-BGD-TCC-ABQ-PHX) FL310, 40 MI SW SCN DIRECT GAG. XING PATH OF CPR. CONFLICT ALERT ACTIVATED WHEN CPR WAS DSNDING FROM FL350. CPR WAS INSTRUCTED TO MAINTAIN FL330. HE RESPONDED THAT HE WOULD DSND BELOW FL330 BEFORE HE COULD START TO CLB. SEPARATION WAS LOST AT THAT TIME AND THE ERROR OCCURRED. I FELT A NUMBER OF THINGS HAPPENED TO CONTRIBUTE TO THE ERROR. 1) A LINE OF TSTMS FORCED TFC INTO SECTOR CREATING A COMPLEX TFC SIT. 2) INEXPERIENCED ASSISTANT CTLR. 3) NOISE LEVEL IMMEDIATE AREA. 4) NO HISTORY ON SECTOR THAT EVENING. 5) POOR LIGHTING IN AREA -- HAD TO STRUGGLE TO SEE KEYBOARD. SOLUTION: DRAW YOUR OWN CONCLUSION.
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.