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ZBW controller described conflict at 15000 when VFR traffic descended toward IFR aircraft; traffic issued; avoidance descent and turns issued.
| Attributes | |
| ACN | 754762 |
| Time | |
| Date | 200709 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | navaid : baf.vortac |
| State Reference | MA |
| Altitude | msl single value : 15000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zbw.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | A340 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zbw.artcc |
| Make Model Name | PC-12 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 24 controller time certified in position1 : 20 |
| ASRS Report | 754762 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : developmental |
| Experience | controller military : 3 controller radar : 3 |
| ASRS Report | 754763 |
| Events | |
| Anomaly | conflict : airborne less severe |
| Independent Detector | atc equipment : conflict alert other controllera other controllerb |
| Resolutory Action | controller : issued new clearance controller : issued advisory controller : issued alert none taken : anomaly accepted |
| Miss Distance | horizontal : 12000 vertical : 300 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
Narrative:
Air carrier X was wbound on V292 approaching baf VORTAC at 16000 ft. I issued traffic to air carrier X at 2 O'clock position 10 mi swbound at 16500 ft unverified. After acknowledging the traffic call air carrier X asked for lower to stay clear. I issued air carrier X 15000 ft due to additional traffic at 14000 ft. About a min later air carrier X asked if we were talking to the traffic and if he could descend further since the traffic had just started to descend. I advised air carrier X lower was not available due to traffic just below him and asked if he wanted a turn. He said yes. I issued a left turn to heading 210 degrees (approximately 80 degrees left) traffic kept descending and heading swbound. Traffic past about 2 mi and 300 ft above. We tracked the VFR target through bdl approach and new york TRACON where they were able to identify the aircraft and had the pilot call boston ARTCC.
Original NASA ASRS Text
Title: ZBW CTLR DESCRIBED CONFLICT AT 15000 WHEN VFR TFC DESCENDED TOWARD IFR ACFT; TFC ISSUED; AVOIDANCE DESCENT AND TURNS ISSUED.
Narrative: ACR X WAS WBOUND ON V292 APCHING BAF VORTAC AT 16000 FT. I ISSUED TFC TO ACR X AT 2 O'CLOCK POS 10 MI SWBOUND AT 16500 FT UNVERIFIED. AFTER ACKNOWLEDGING THE TFC CALL ACR X ASKED FOR LOWER TO STAY CLR. I ISSUED ACR X 15000 FT DUE TO ADDITIONAL TFC AT 14000 FT. ABOUT A MIN LATER ACR X ASKED IF WE WERE TALKING TO THE TFC AND IF HE COULD DSND FURTHER SINCE THE TFC HAD JUST STARTED TO DSND. I ADVISED ACR X LOWER WAS NOT AVAILABLE DUE TO TFC JUST BELOW HIM AND ASKED IF HE WANTED A TURN. HE SAID YES. I ISSUED A L TURN TO HDG 210 DEGS (APPROX 80 DEGS L) TFC KEPT DSNDING AND HDG SWBOUND. TFC PAST ABOUT 2 MI AND 300 FT ABOVE. WE TRACKED THE VFR TARGET THROUGH BDL APCH AND NEW YORK TRACON WHERE THEY WERE ABLE TO IDENT THE ACFT AND HAD THE PLT CALL BOSTON ARTCC.
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.