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ZBW controller experienced operational error at FL250 misjudging aircraft spacing and failing to note airspeed changes.
| Attributes | |
| ACN | 750064 |
| Time | |
| Date | 200708 |
| Place | |
| Locale Reference | navaid : gdm.vor |
| State Reference | MA |
| Altitude | msl single value : 25000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zbw.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zbw.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Brasilia EMB-120 All Series |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 14 |
| ASRS Report | 750064 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 76940 vertical : 8991 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
B757 was descending into bos. E120 was direct bgr. B757 lost 20 KTS ground speed. E120 gained 40 KTS. Lateral separation was lost.
Original NASA ASRS Text
Title: ZBW CTLR EXPERIENCED OPERROR AT FL250 MISJUDGING ACFT SPACING AND FAILING TO NOTE AIRSPEED CHANGES.
Narrative: B757 WAS DSNDING INTO BOS. E120 WAS DIRECT BGR. B757 LOST 20 KTS GND SPD. E120 GAINED 40 KTS. LATERAL 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.