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A radar controller at ZSE misjudged the closure between converging traffic resulting in a loss of separation.
| Attributes | |
| ACN | 570158 |
| Time | |
| Date | 200301 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : zse.artcc |
| State Reference | WA |
| Altitude | msl single value : 18600 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zse.artcc tower : yyz.tower |
| Operator | common carrier : air carrier |
| Make Model Name | Regional Jet 700 ER&LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zse.artcc |
| Operator | general aviation : personal |
| Make Model Name | Cessna 340/340A |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller military : 11 controller radar : 23 |
| ASRS Report | 570158 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne critical non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : radar other controllera other flight crewa other flight crewb |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action |
| Miss Distance | horizontal : 25200 vertical : 300 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
A CR57/I departed at medford, or, filed V122.lmt J189 ave SADDE6 lax. A C340/I was sebound from eugene, or, to bakersfield, ca, direct at FL190. On initial contact, I climbed crj to FL180 until clear of the overflt traffic. Once clear of the C340, I climbed crj to FL230. At that time, crj requested direct lin. I waited 30 seconds before issuing the direct clearance, thinking the crj was clear of the C340. The crj turned direct lin and began overtaking the C340. I thought I would have at least 5 NM lateral separation and continued working traffic. I observed the crj and C340 converging and issued 15 degree turns to both aircraft. The immediate alert went off and I issued an additional turn to heading 090 degrees to regain separation.
Original NASA ASRS Text
Title: A RADAR CTLR AT ZSE MISJUDGED THE CLOSURE BTWN CONVERGING TFC RESULTING IN A LOSS OF SEPARATION.
Narrative: A CR57/I DEPARTED AT MEDFORD, OR, FILED V122.LMT J189 AVE SADDE6 LAX. A C340/I WAS SEBOUND FROM EUGENE, OR, TO BAKERSFIELD, CA, DIRECT AT FL190. ON INITIAL CONTACT, I CLBED CRJ TO FL180 UNTIL CLR OF THE OVERFLT TFC. ONCE CLR OF THE C340, I CLBED CRJ TO FL230. AT THAT TIME, CRJ REQUESTED DIRECT LIN. I WAITED 30 SECONDS BEFORE ISSUING THE DIRECT CLRNC, THINKING THE CRJ WAS CLR OF THE C340. THE CRJ TURNED DIRECT LIN AND BEGAN OVERTAKING THE C340. I THOUGHT I WOULD HAVE AT LEAST 5 NM LATERAL SEPARATION AND CONTINUED WORKING TFC. I OBSERVED THE CRJ AND C340 CONVERGING AND ISSUED 15 DEG TURNS TO BOTH ACFT. THE IMMEDIATE ALERT WENT OFF AND I ISSUED AN ADDITIONAL TURN TO HDG 090 DEGS TO REGAIN SEPARATION.
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.