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ZSE controller loses separation when vectoring an MD80 behind and in-trail of a B737 at FL310 en route to sea.
| Attributes | |
| ACN | 612381 |
| Time | |
| Date | 200403 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : pdx.vor |
| State Reference | OR |
| Altitude | msl single value : 31000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zse.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-400 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zse.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Series (DC-9-80) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 14 |
| ASRS Report | 612381 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne less severe inflight encounter : weather non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | none taken : insufficient time |
| Miss Distance | horizontal : 27000 vertical : 0 |
| Supplementary | |
| Problem Areas | Environmental Factor Weather ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Sector complexity -- moderate, workload (volume) -- moderate. Approximately 14 aircraft on frequency. 2 aircraft were being sequenced in-trail for sea, south of btg VORTAC for the olympia arrival. Aircraft #2 was turned to a 020 degree heading to go behind aircraft #1. Winds out of the west at 90 KTS. Aircraft #2 picked up speed and separation was lost.
Original NASA ASRS Text
Title: ZSE CTLR LOSES SEPARATION WHEN VECTORING AN MD80 BEHIND AND IN-TRAIL OF A B737 AT FL310 ENRTE TO SEA.
Narrative: SECTOR COMPLEXITY -- MODERATE, WORKLOAD (VOLUME) -- MODERATE. APPROX 14 ACFT ON FREQ. 2 ACFT WERE BEING SEQUENCED IN-TRAIL FOR SEA, S OF BTG VORTAC FOR THE OLYMPIA ARR. ACFT #2 WAS TURNED TO A 020 DEG HDG TO GO BEHIND ACFT #1. WINDS OUT OF THE W AT 90 KTS. ACFT #2 PICKED UP SPD AND SEPARATION WAS LOST.
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.