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ZBW controller experienced operational error at FL190 descending traffic through occupied altitude while being attentive to different traffic in another part of the assigned airspace.
| Attributes | |
| ACN | 695398 |
| Time | |
| Date | 200604 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | navaid : hto.vortac |
| State Reference | NY |
| Altitude | msl single value : 19000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zbw.artcc |
| Operator | general aviation : corporate |
| Make Model Name | Falcon 900 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zbw.artcc |
| Operator | other |
| Make Model Name | Hercules (C-130) |
| 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 time certified in position1 : 16 |
| ASRS Report | 695398 |
| Person 2 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | controller : issued new clearance controller : issued alert |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 24000 vertical : 0 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
F900 landing new bedford; the C130 en route to nhz. The F900 and C130 were converging; the C130 at FL190; the F900 at FL200. The F900 was issued a descent for ewb believing that the C130 would not be a factor. The sector got busy in the southern portion with multiple departures. When the descent of the F900 was re-evaluated; it was realized that the F900 would need to be turned and expedited down to maintain separation. The F900 was turned and expedited and the C130 was turned. Separation was lost.
Original NASA ASRS Text
Title: ZBW CTLR EXPERIENCED OPERROR AT FL190 DSNDING TFC THROUGH OCCUPIED ALT WHILE BEING ATTENTIVE TO DIFFERENT TFC IN ANOTHER PART OF THE ASSIGNED AIRSPACE.
Narrative: F900 LNDG NEW BEDFORD; THE C130 ENRTE TO NHZ. THE F900 AND C130 WERE CONVERGING; THE C130 AT FL190; THE F900 AT FL200. THE F900 WAS ISSUED A DSCNT FOR EWB BELIEVING THAT THE C130 WOULD NOT BE A FACTOR. THE SECTOR GOT BUSY IN THE SOUTHERN PORTION WITH MULTIPLE DEPS. WHEN THE DSCNT OF THE F900 WAS RE-EVALUATED; IT WAS REALIZED THAT THE F900 WOULD NEED TO BE TURNED AND EXPEDITED DOWN TO MAINTAIN SEPARATION. THE F900 WAS TURNED AND EXPEDITED AND THE C130 WAS TURNED. SEPARATION WAS LOST.
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.