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ZBW controller described pilot deviation/loss of separation; when flight crew descended below assigned altitude after acknowledging correct instruction.
| Attributes | |
| ACN | 793168 |
| Time | |
| Date | 200806 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : zbw.artcc |
| State Reference | NH |
| Altitude | msl bound lower : 25000 msl bound upper : 28000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zbw.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Regional Jet CL65 Undifferentiated or Other Model |
| 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 : 2 controller radar : 18 controller supervisory : 1 |
| ASRS Report | 793168 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar instruction : instructor |
| Qualification | controller : radar |
| Experience | controller radar : 21 |
| ASRS Report | 793170 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : required legal separation non adherence : clearance |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | none taken : anomaly accepted |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Pilot assigned and read back FL280. Speed 250 KTS. Pilot descended to FL250 into another aircraft. Supplemental information from acn 793170: the radar controller assigned FL280 and the pilot read back the correct altitude. The aircraft descended below FL280 to FL250.
Original NASA ASRS Text
Title: ZBW CTLR DESCRIBED PLTDEV/LOSS OF SEPARATION; WHEN FLT CREW DESCENDED BELOW ASSIGNED ALT AFTER ACKNOWLEDGING CORRECT INSTRUCTION.
Narrative: PLT ASSIGNED AND READ BACK FL280. SPD 250 KTS. PLT DSNDED TO FL250 INTO ANOTHER ACFT. SUPPLEMENTAL INFO FROM ACN 793170: THE RADAR CTLR ASSIGNED FL280 AND THE PLT READ BACK THE CORRECT ALT. THE ACFT DSNDED BELOW FL280 TO FL250.
Data retrieved from NASA's ASRS site as of May 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.