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ARTCC radar controller failed to provide standard radar separation between 2 aircraft under his control.
| Attributes | |
| ACN | 144563 |
| Time | |
| Date | 199005 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : btg |
| State Reference | WA |
| Altitude | msl bound lower : 11000 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zse |
| Operator | common carrier : air carrier |
| Make Model Name | Small Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 1 |
| ASRS Report | 144563 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : non radar controller : flight data |
| Qualification | controller : radar |
| ASRS Report | 144562 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | other other : unspecified |
| Resolutory Action | none taken : detected after the fact |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 4200 vertical : 400 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
A small transport and an large transport were inbound to pdx on the helens 1 arrival from sea. Large transport was in-trail of the small transport approximately 10-15 mi. I gave small transport a restriction to cross kalma at and maintain 10000'. Small transport wa level at 13000' and the pilot reported leaving 13000'. Large transport was level at FL190. Was told to descend and maintain 13000'. Small transport was told to report leaving 11000'. After a period of time small transport reported leaving 11000'. At this time I told the small transport to contact pdx approach, and told the large transport to cross kalma at and maintain 11000' at 250 KTS. Mode C was lost on large transport at approximately 15300'.
Original NASA ASRS Text
Title: ARTCC RADAR CTLR FAILED TO PROVIDE STANDARD RADAR SEPARATION BETWEEN 2 ACFT UNDER HIS CONTROL.
Narrative: A SMT AND AN LGT WERE INBND TO PDX ON THE HELENS 1 ARR FROM SEA. LGT WAS IN-TRAIL OF THE SMT APPROX 10-15 MI. I GAVE SMT A RESTRICTION TO CROSS KALMA AT AND MAINTAIN 10000'. SMT WA LEVEL AT 13000' AND THE PLT RPTED LEAVING 13000'. LGT WAS LEVEL AT FL190. WAS TOLD TO DSND AND MAINTAIN 13000'. SMT WAS TOLD TO RPT LEAVING 11000'. AFTER A PERIOD OF TIME SMT RPTED LEAVING 11000'. AT THIS TIME I TOLD THE SMT TO CONTACT PDX APCH, AND TOLD THE LGT TO CROSS KALMA AT AND MAINTAIN 11000' AT 250 KTS. MODE C WAS LOST ON LGT AT APPROX 15300'.
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.