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Operational error occurs as ZSE controller sector change is completed with metered, holding at olm VORTAC.
| Attributes | |
| ACN | 514276 |
| Time | |
| Date | 200106 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : olm.vortac |
| Altitude | msl single value : 20000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zse.artcc tower : clt.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : vacating altitude |
| 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 : vacating altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 18 |
| ASRS Report | 514276 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller non radar : 14 controller radar : 12 |
| ASRS Report | 514514 |
| Events | |
| Anomaly | conflict : airborne less severe inflight encounter : weather non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera other controllerb |
| Resolutory Action | controller : issued new clearance |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 16500 vertical : 100 |
| Supplementary | |
| Problem Areas | Weather ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft X was sbound and aircraft Y northbound on diverging heading. We were metering to sea with 10-15 min delays. I was concerned with meeting aircraft X time at olm and forgot about aircraft Y descending on the olm STAR. Aircraft Y was going to have to take an 8 min delay. We had just completed a heavy traffic push with very little notice of those kinds of delays. Supplemental information from acn 514514: when I sat down, metering was a factor, too concerned to meet times versus a mi-in-trail program, easier on controller workload. Human error, people aren't perfect. Metering, aircraft X had been turned to 190 degree heading, south of olm descending to FL190 northbound aircraft Y had been descended to FL200 (out of about FL220) d-side prompted d-side that the aircraft X would now meet his time and was turned back olm. I took a briefing and told aircraft Y at olm turn left heading 200 degrees. 15 seconds later aircraft X caught aircraft Y from behind. Turned aircraft Y to 280 degree heading and descended to FL160. Separation had already been lost.
Original NASA ASRS Text
Title: OPERROR OCCURS AS ZSE CTLR SECTOR CHANGE IS COMPLETED WITH METERED, HOLDING AT OLM VORTAC.
Narrative: ACFT X WAS SBOUND AND ACFT Y NBOUND ON DIVERGING HEADING. WE WERE METERING TO SEA WITH 10-15 MIN DELAYS. I WAS CONCERNED WITH MEETING ACFT X TIME AT OLM AND FORGOT ABOUT ACFT Y DSNDING ON THE OLM STAR. ACFT Y WAS GOING TO HAVE TO TAKE AN 8 MIN DELAY. WE HAD JUST COMPLETED A HVY TFC PUSH WITH VERY LITTLE NOTICE OF THOSE KINDS OF DELAYS. SUPPLEMENTAL INFO FROM ACN 514514: WHEN I SAT DOWN, METERING WAS A FACTOR, TOO CONCERNED TO MEET TIMES VERSUS A MI-IN-TRAIL PROGRAM, EASIER ON CTLR WORKLOAD. HUMAN ERROR, PEOPLE AREN'T PERFECT. METERING, ACFT X HAD BEEN TURNED TO 190 DEG HDG, S OF OLM DSNDING TO FL190 NBOUND ACFT Y HAD BEEN DSNDED TO FL200 (OUT OF ABOUT FL220) D-SIDE PROMPTED D-SIDE THAT THE ACFT X WOULD NOW MEET HIS TIME AND WAS TURNED BACK OLM. I TOOK A BRIEFING AND TOLD ACFT Y AT OLM TURN L HEADING 200 DEGS. 15 SECONDS LATER ACFT X CAUGHT ACFT Y FROM BEHIND. TURNED ACFT Y TO 280 DEG HDG AND DSNDED TO FL160. SEPARATION HAD ALREADY BEEN 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.