 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
ZSE controller experienced operational error at approximately FL330 when misjudging climb rate of one aircraft and the turn rate of another.
| Attributes | |
| ACN | 703427 |
| Time | |
| Date | 200607 |
| Place | |
| Locale Reference | navaid : mlp.vor |
| State Reference | WA |
| Altitude | msl bound lower : 33000 msl bound upper : 34000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zse.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | A310 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : enroute altitude change |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zse.artcc |
| Operator | general aviation : corporate |
| Make Model Name | Falcon 900 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : enroute altitude change |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 2.5 controller time certified in position2 : 9 flight time total : 120 |
| ASRS Report | 703427 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne critical non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | controller : issued alert controller : issued new clearance flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 28500 vertical : 400 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X (A310) climbing off geg east direct mlp and aircraft Y (F900) climbing off gpi sbound. Air carrier X climbing to FL330 and aircraft Y to FL380. Air carrier X and aircraft Y were traffic east of mlp. I had aircraft Y expedite climb through FL340 for the air carrier X. When I realized I would not have separation; I turned air carrier X to heading 060 degrees to go behind aircraft Y. When I realized that the turn would not be enough; I turned the air carrier X further to heading 030 degrees. Air carrier X route turned at mlp. I did not realize the turn would be so pronounced. I was anticipating a shallow turn which would have put air carrier X behind aircraft Y. Also contributing was the fact that aircraft Y was not climbing as fast as I was anticipating.
Original NASA ASRS Text
Title: ZSE CTLR EXPERIENCED OPERROR AT APPROX FL330 WHEN MISJUDGING CLB RATE OF ONE ACFT AND THE TURN RATE OF ANOTHER.
Narrative: ACR X (A310) CLBING OFF GEG E DIRECT MLP AND ACFT Y (F900) CLBING OFF GPI SBOUND. ACR X CLBING TO FL330 AND ACFT Y TO FL380. ACR X AND ACFT Y WERE TFC E OF MLP. I HAD ACFT Y EXPEDITE CLB THROUGH FL340 FOR THE ACR X. WHEN I REALIZED I WOULD NOT HAVE SEPARATION; I TURNED ACR X TO HDG 060 DEGS TO GO BEHIND ACFT Y. WHEN I REALIZED THAT THE TURN WOULD NOT BE ENOUGH; I TURNED THE ACR X FURTHER TO HDG 030 DEGS. ACR X RTE TURNED AT MLP. I DID NOT REALIZE THE TURN WOULD BE SO PRONOUNCED. I WAS ANTICIPATING A SHALLOW TURN WHICH WOULD HAVE PUT ACR X BEHIND ACFT Y. ALSO CONTRIBUTING WAS THE FACT THAT ACFT Y WAS NOT CLBING AS FAST AS I WAS ANTICIPATING.
Data retrieved from NASA's ASRS site as of January 2009 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.