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Late traffic call by ATC and altitude overshot by a climbing B737, which resulted in an near midair collision with a VFR aircraft at 17500 ft on frequency with ZBW.
| Attributes | |
| ACN | 623422 |
| Time | |
| Date | 200406 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : zbw.artcc |
| State Reference | MA |
| Altitude | msl bound lower : 17000 msl bound upper : 17300 |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Controlling Facilities | artcc : zbw.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zbw.artcc |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 200 flight time total : 22000 flight time type : 8000 |
| ASRS Report | 623422 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | conflict : nmac |
| Independent Detector | atc equipment : conflict alert aircraft equipment : tcas other controllera |
| Resolutory Action | controller : issued new clearance controller : separated traffic flight crew : returned to assigned altitude |
| Miss Distance | horizontal : 0 vertical : 400 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Environmental Factor ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Climbing in bos departure airspace to FL230. As we were passing 16600 ft, climbing at a rate of 4000 FPM, we were given an amended clearance to level at 17000 ft for VFR traffic which was reported at 17500 ft and slightly went to 17300 ft before returning to 17000 ft. Just after we leveled off at 17000 ft, we got a TA and an RA which was to 'monitor vertical speed.' we saw the light twin engine aircraft. Vertical separation was 400 ft right above us. No deviation was necessary.
Original NASA ASRS Text
Title: LATE TFC CALL BY ATC AND ALT OVERSHOT BY A CLBING B737, WHICH RESULTED IN AN NMAC WITH A VFR ACFT AT 17500 FT ON FREQ WITH ZBW.
Narrative: CLBING IN BOS DEP AIRSPACE TO FL230. AS WE WERE PASSING 16600 FT, CLBING AT A RATE OF 4000 FPM, WE WERE GIVEN AN AMENDED CLRNC TO LEVEL AT 17000 FT FOR VFR TFC WHICH WAS RPTED AT 17500 FT AND SLIGHTLY WENT TO 17300 FT BEFORE RETURNING TO 17000 FT. JUST AFTER WE LEVELED OFF AT 17000 FT, WE GOT A TA AND AN RA WHICH WAS TO 'MONITOR VERT SPD.' WE SAW THE LIGHT TWIN ENG ACFT. VERT SEPARATION WAS 400 FT RIGHT ABOVE US. NO DEV WAS NECESSARY.
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.