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ZBW controller described an near midair collision at 5500 ft reported by a VFR aircraft on frequency; indicating lack of data block information on second aircraft.
| Attributes | |
| ACN | 711448 |
| Time | |
| Date | 200609 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : ctr.vor |
| State Reference | MA |
| Altitude | msl single value : 5500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zbw.artcc |
| Operator | general aviation : personal |
| Make Model Name | Skyhawk 172/Cutlass 172 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Flight Plan | VFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : y90.tracon |
| Operator | general aviation : personal |
| Make Model Name | Bonanza 35 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar instruction : instructor |
| Qualification | controller : radar |
| Experience | controller radar : 26 controller time certified in position1 : 21 |
| ASRS Report | 711448 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Events | |
| Anomaly | conflict : nmac |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | none taken : detected after the fact |
| Miss Distance | horizontal : 300 vertical : 0 |
| Supplementary | |
| Problem Areas | FAA Flight Crew Human Performance ATC Human Performance |
| Primary Problem | Ambiguous |
Narrative:
Aircraft #1 calls for VFR advisories and is idented. Approximately 1 min later states he had a near midair. Aircraft #2 is handed off from bradley approach. I took to the frequency to ask aircraft #2 if he saw the other aircraft. He stated yes and that bdl approach never called it. I believe that proximity to long range surveillance radar sight caused the limited data block of aircraft #2 not to be displayed on sector 36 radar display.
Original NASA ASRS Text
Title: ZBW CTLR DESCRIBED AN NMAC AT 5500 FT RPTED BY A VFR ACFT ON FREQ; INDICATING LACK OF DATA BLOCK INFO ON SECOND ACFT.
Narrative: ACFT #1 CALLS FOR VFR ADVISORIES AND IS IDENTED. APPROX 1 MIN LATER STATES HE HAD A NEAR MIDAIR. ACFT #2 IS HANDED OFF FROM BRADLEY APCH. I TOOK TO THE FREQ TO ASK ACFT #2 IF HE SAW THE OTHER ACFT. HE STATED YES AND THAT BDL APCH NEVER CALLED IT. I BELIEVE THAT PROX TO LONG RANGE SURVEILLANCE RADAR SIGHT CAUSED THE LIMITED DATA BLOCK OF ACFT #2 NOT TO BE DISPLAYED ON SECTOR 36 RADAR DISPLAY.
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.