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ZSE controller experienced operational error at FL190 when vectoring arrival traffic for sea and allowing succeeding traffic to overtake preceding traffic.
| Attributes | |
| ACN | 732008 |
| Time | |
| Date | 200703 |
| Place | |
| Locale Reference | airport : olm.airport |
| State Reference | WA |
| Altitude | msl single value : 19000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zse.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-900 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach ground : maintenance |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zse.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | MD-83 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 15 |
| ASRS Report | 732008 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 27600 vertical : 300 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft X was turned left to 290 degrees. When I had what I considered to be adequate spacing; I turned aircraft X direct olm. When aircraft Y was approximately 10 mi south of olm; I noticed that aircraft X was less than 6 mi behind aircraft Y with a significant overtake. I stopped aircraft X's descent and turned him left. I turned aircraft Y right and continued his descent.
Original NASA ASRS Text
Title: ZSE CTLR EXPERIENCED OPERROR AT FL190 WHEN VECTORING ARR TFC FOR SEA AND ALLOWING SUCCEEDING TFC TO OVERTAKE PRECEDING TFC.
Narrative: ACFT X WAS TURNED L TO 290 DEGS. WHEN I HAD WHAT I CONSIDERED TO BE ADEQUATE SPACING; I TURNED ACFT X DIRECT OLM. WHEN ACFT Y WAS APPROX 10 MI S OF OLM; I NOTICED THAT ACFT X WAS LESS THAN 6 MI BEHIND ACFT Y WITH A SIGNIFICANT OVERTAKE. I STOPPED ACFT X'S DSCNT AND TURNED HIM L. I TURNED ACFT Y R AND CONTINUED HIS DSCNT.
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.