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ZSE controller experienced operational error at 10000 ft when spacing judgement was based upon incorrect aircraft type.
| Attributes | |
| ACN | 661727 |
| Time | |
| Date | 200506 |
| Place | |
| Locale Reference | navaid : olm.vortac |
| State Reference | WA |
| Altitude | msl single value : 10000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zse.artcc |
| Operator | general aviation : personal |
| Make Model Name | Cessna 210 Centurion / Turbo Centurion 210C 210D |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Flight Plan | VFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zse.artcc |
| Operator | general aviation : personal |
| Make Model Name | Light Transport High Wing 2 Turboprop Eng |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : approach |
| Route In Use | arrival star : n/a |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : non radar controller : radar |
| Experience | controller non radar : 20 controller radar : 20 controller time certified in position1 : 5 |
| ASRS Report | 661727 |
| Person 2 | |
| Affiliation | other |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 3000 vertical : 500 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
The C210 was given a clearance to cross olm at 10000 ft (landing rnt). The P180 was given a 'descend via' (for jets) clearance to sea; which is to cross olm at 17000 ft; cross arvad at 12000 ft. I believed the P180 was a jet and expected him to do the above clearance. Instead; he descended to 10000 ft and got too close to the C210.
Original NASA ASRS Text
Title: ZSE CTLR EXPERIENCED OPERROR AT 10000 FT WHEN SPACING JUDGEMENT WAS BASED UPON INCORRECT ACFT TYPE.
Narrative: THE C210 WAS GIVEN A CLRNC TO CROSS OLM AT 10000 FT (LNDG RNT). THE P180 WAS GIVEN A 'DSND VIA' (FOR JETS) CLRNC TO SEA; WHICH IS TO CROSS OLM AT 17000 FT; CROSS ARVAD AT 12000 FT. I BELIEVED THE P180 WAS A JET AND EXPECTED HIM TO DO THE ABOVE CLRNC. INSTEAD; HE DSNDED TO 10000 FT AND GOT TOO CLOSE TO THE C210.
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.