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Controller forgot about opposite direction traffic (aircraft Y) and descended aircraft X through aircraft Y.
| Attributes | |
| ACN | 461959 |
| Time | |
| Date | 200001 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| State Reference | NM |
| Altitude | msl single value : 41700 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zab.artcc |
| Operator | general aviation : personal |
| Make Model Name | Citation X |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : vacating altitude |
| Route In Use | arrival star : sunny 2 |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zab.artcc |
| Operator | general aviation : personal |
| Make Model Name | Citation X |
| 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 : 4 controller radar : 15 controller time certified in position1 : 15 |
| ASRS Report | 461959 |
| Person 2 | |
| Affiliation | other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert atc equipment other atc equipment : edp other controllera other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action none taken : detected after the fact |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 18000 vertical : 700 |
| Supplementary | |
| Problem Areas | Environmental Factor ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft Y, a C750, was eastbound at FL410, aircraft X, a C750, was wbound at FL430. I xferred communications of aircraft Y to next sector after handoff. I then dropped his data block off my scope. I then descended aircraft X to FL390 to begin sequencing him on the sunny 2 arrival. Less than 1 min later, conflict alert was activated. I tried turning aircraft X 30 degrees right but received no answer, I then told him to turn 30 degrees right again, but my transmission was blocked. I told him again to turn 30 degrees right and he advised he was receiving an RA to climb from TCASII. Event occurred in the 7TH hour of 8 hour shift and I believe I was mentally fatigued at the time. The ultrahigh sector above my airspace could have been opened at the time also taking some (actually would have been 5 aircraft) of the 20 aircraft I had at the time. Use of more powerful radios may have helped. Our radios are always being blocked by those of aircraft.
Original NASA ASRS Text
Title: CTLR FORGOT ABOUT OPPOSITE DIRECTION TFC (ACFT Y) AND DSNDED ACFT X THROUGH ACFT Y.
Narrative: ACFT Y, A C750, WAS EBOUND AT FL410, ACFT X, A C750, WAS WBOUND AT FL430. I XFERRED COMS OF ACFT Y TO NEXT SECTOR AFTER HDOF. I THEN DROPPED HIS DATA BLOCK OFF MY SCOPE. I THEN DSNDED ACFT X TO FL390 TO BEGIN SEQUENCING HIM ON THE SUNNY 2 ARR. LESS THAN 1 MIN LATER, CONFLICT ALERT WAS ACTIVATED. I TRIED TURNING ACFT X 30 DEGS R BUT RECEIVED NO ANSWER, I THEN TOLD HIM TO TURN 30 DEGS R AGAIN, BUT MY XMISSION WAS BLOCKED. I TOLD HIM AGAIN TO TURN 30 DEGS R AND HE ADVISED HE WAS RECEIVING AN RA TO CLB FROM TCASII. EVENT OCCURRED IN THE 7TH HR OF 8 HR SHIFT AND I BELIEVE I WAS MENTALLY FATIGUED AT THE TIME. THE ULTRAHIGH SECTOR ABOVE MY AIRSPACE COULD HAVE BEEN OPENED AT THE TIME ALSO TAKING SOME (ACTUALLY WOULD HAVE BEEN 5 ACFT) OF THE 20 ACFT I HAD AT THE TIME. USE OF MORE POWERFUL RADIOS MAY HAVE HELPED. OUR RADIOS ARE ALWAYS BEING BLOCKED BY THOSE OF ACFT.
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.