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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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ZBW controller experienced operational error at 15000 when misjudging the distance required for a descending air carrier to pass behind a BE58.
| Attributes | |
| ACN | 761581 |
| Time | |
| Date | 200711 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : gdm.airport |
| State Reference | MA |
| Altitude | msl single value : 15000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zbw.artcc |
| Operator | general aviation : personal |
| Make Model Name | Baron 58/58TC |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : approach ground : parked |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zbw.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | A319 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller limited radar : 20 controller non radar : 20 controller radar : 20 controller time certified in position1 : 5 |
| ASRS Report | 761581 |
| Person 2 | |
| Affiliation | other |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert aircraft equipment : tcas other controllera |
| Resolutory Action | controller : issued alert controller : issued new clearance flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 28200 vertical : 300 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
X was cleared to descend to 11000 ft and direct lci. Y descending to bos; passing behind X. Controller noticed X stopped descent and turned approximately 40 degrees left. Controller idented situation and attempted to maintain separation; but was unable to do so.
Original NASA ASRS Text
Title: ZBW CTLR EXPERIENCED OPERROR AT 15000 WHEN MISJUDGING THE DISTANCE REQUIRED FOR A DESCENDING ACR TO PASS BEHIND A BE58.
Narrative: X WAS CLRED TO DSND TO 11000 FT AND DIRECT LCI. Y DSNDING TO BOS; PASSING BEHIND X. CTLR NOTICED X STOPPED DSCNT AND TURNED APPROX 40 DEGS L. CTLR IDENTED SITUATION AND ATTEMPTED TO MAINTAIN SEPARATION; BUT WAS UNABLE TO DO SO.
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.