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Flight crew of an large transport descended below assigned descent altitude in response to a TCASII RA. Near midair collision.
| Attributes | |
| ACN | 301596 |
| Time | |
| Date | 199504 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : bos |
| State Reference | MA |
| Altitude | msl bound lower : 9000 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zbw |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | enroute airway : v431 |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | other : unknown |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 225 flight time total : 7000 flight time type : 3000 |
| ASRS Report | 301596 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : nmac non adherence : clearance other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 500 vertical : 500 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
At 11000 ft on V-431 going in to bos, center called traffic 10500 ft and climbing slowly at 11 O'clock and 2 or 3 mi. We then received a TCASII TA. We still did not have the aircraft visually. Then we told center we had the aircraft on TCASII. About that time we received a TCASII RA to 'descend.' we started our descent following the TCASII RA and told center we had a TCASII RA and were descending. Center cleared us to 9000 ft. We also picked up the aircraft visually as we passed below it and off to our left side. Good call by ATC, and TCASII.
Original NASA ASRS Text
Title: FLC OF AN LGT DSNDED BELOW ASSIGNED DSCNT ALT IN RESPONSE TO A TCASII RA. NMAC.
Narrative: AT 11000 FT ON V-431 GOING IN TO BOS, CTR CALLED TFC 10500 FT AND CLBING SLOWLY AT 11 O'CLOCK AND 2 OR 3 MI. WE THEN RECEIVED A TCASII TA. WE STILL DID NOT HAVE THE ACFT VISUALLY. THEN WE TOLD CTR WE HAD THE ACFT ON TCASII. ABOUT THAT TIME WE RECEIVED A TCASII RA TO 'DSND.' WE STARTED OUR DSCNT FOLLOWING THE TCASII RA AND TOLD CTR WE HAD A TCASII RA AND WERE DSNDING. CTR CLRED US TO 9000 FT. WE ALSO PICKED UP THE ACFT VISUALLY AS WE PASSED BELOW IT AND OFF TO OUR L SIDE. GOOD CALL BY ATC, AND TCASII.
Data retrieved from NASA's ASRS site as of July 2007 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.