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Small transport turboprop business crew and a B757 had a conflict in bos class B. The small transport crew claims they were cleared to 5000 ft, the departure controller said they were cleared to 4000 ft.
| Attributes | |
| ACN | 590293 |
| Time | |
| Date | 200308 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : bos.airport |
| State Reference | MA |
| Altitude | msl bound lower : 4500 msl bound upper : 5000 |
| Environment | |
| Flight Conditions | Mixed |
| Weather Elements | Rain |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : a90.tracon |
| Operator | general aviation : corporate |
| Make Model Name | Small Transport, Low Wing, 2 Turboprop Eng |
| Operating Under FAR Part | Part 91 |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : a90.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : corporate |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : cfi pilot : commercial pilot : instrument pilot : multi engine |
| Experience | flight time last 90 days : 40 flight time total : 8950 flight time type : 5000 |
| ASRS Report | 590293 |
| Person 2 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | altitude deviation : overshoot conflict : airborne less severe non adherence : clearance non adherence : published procedure |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued alert controller : separated traffic flight crew : returned to assigned altitude |
| Supplementary | |
| Problem Areas | ATC Human Performance Flight Crew Human Performance |
| Primary Problem | Ambiguous |
Narrative:
Departed bos logan airport, handed off to departure, instructed to fly 270 degree heading and climb to 5000 ft. As we approached 4000 ft, ATC advised traffic at 2 O'clock position, 4 mi, 5000 ft swbound. Climbing through 4500 ft, we spotted the traffic, a B757 at 2 O'clock position, and about 4 mi. ATC called and ordered an immediate descent to 4000 ft and advised we were assigned only 4000 ft. We still had the traffic in sight and the captain and I were sure we had been given 5000 ft. We passed below and behind the traffic with no conflict.
Original NASA ASRS Text
Title: SMT TURBOPROP BUSINESS CREW AND A B757 HAD A CONFLICT IN BOS CLASS B. THE SMT CREW CLAIMS THEY WERE CLRED TO 5000 FT, THE DEP CTLR SAID THEY WERE CLRED TO 4000 FT.
Narrative: DEPARTED BOS LOGAN ARPT, HANDED OFF TO DEP, INSTRUCTED TO FLY 270 DEG HDG AND CLB TO 5000 FT. AS WE APCHED 4000 FT, ATC ADVISED TFC AT 2 O'CLOCK POS, 4 MI, 5000 FT SWBOUND. CLBING THROUGH 4500 FT, WE SPOTTED THE TFC, A B757 AT 2 O'CLOCK POS, AND ABOUT 4 MI. ATC CALLED AND ORDERED AN IMMEDIATE DSCNT TO 4000 FT AND ADVISED WE WERE ASSIGNED ONLY 4000 FT. WE STILL HAD THE TFC IN SIGHT AND THE CAPT AND I WERE SURE WE HAD BEEN GIVEN 5000 FT. WE PASSED BELOW AND BEHIND THE TFC WITH NO CONFLICT.
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.