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ZSE controller experienced operational error at FL210 because of late recognition of decreasing separation.
| Attributes | |
| ACN | 663113 |
| Time | |
| Date | 200506 |
| Place | |
| Locale Reference | airport : sle.airport |
| State Reference | OR |
| Altitude | msl single value : 21000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zse.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Brasilia EMB-120 All Series |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Route In Use | arrival star : n/a |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zse.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : non radar controller : radar |
| Experience | controller non radar : 14 controller radar : 13 |
| ASRS Report | 663113 |
| 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 | other controllera |
| Resolutory Action | controller : issued new clearance |
| Miss Distance | horizontal : 28800 vertical : 0 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
An E120 was ahead of and lower than air carrier Y. I saw the overtake and started E120 down (took away his discretion descent). E120 went down slow and I failed to see the conflict in time to save the deal. Issues include jets descending faster than propellers; mixed traffic on same arrival; propellers at jet altitudes.
Original NASA ASRS Text
Title: ZSE CTLR EXPERIENCED OPERROR AT FL210 BECAUSE OF LATE RECOGNITION OF DECREASING SEPARATION.
Narrative: AN E120 WAS AHEAD OF AND LOWER THAN ACR Y. I SAW THE OVERTAKE AND STARTED E120 DOWN (TOOK AWAY HIS DISCRETION DSCNT). E120 WENT DOWN SLOW AND I FAILED TO SEE THE CONFLICT IN TIME TO SAVE THE DEAL. ISSUES INCLUDE JETS DSNDING FASTER THAN PROPS; MIXED TFC ON SAME ARR; PROPS AT JET ALTS.
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.