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Flight crew of a saab, SF340, responded to a TCASII RA during vectors for an approach within class B airspace from another unknown aircraft to ATC since it did not show a radar return. Reporter noted that the transponder of the other aircraft was intermittent.
| Attributes | |
| ACN | 372667 |
| Time | |
| Date | 199706 |
| Day | Sat |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : bos |
| State Reference | MA |
| Altitude | msl bound lower : 6000 msl bound upper : 6000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : bos tower : ftw |
| Operator | common carrier : air carrier |
| Make Model Name | SF 340A |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | other : unknown |
| Flight Phase | cruise other |
| Flight Plan | None |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 8000 flight time type : 600 |
| ASRS Report | 372667 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : less severe conflict : airborne less severe other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 3000 vertical : 200 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | other |
Narrative:
SAAB340, we were being vectored for approach to boston. With no previous traffic caution, we received a TCASII RA to climb with an airplane 200 ft below us and less than 1/2 mi away. The reply from the other aircraft's transponder appeared intermittent and ATC had no radar reply from that aircraft.
Original NASA ASRS Text
Title: FLC OF A SAAB, SF340, RESPONDED TO A TCASII RA DURING VECTORS FOR AN APCH WITHIN CLASS B AIRSPACE FROM ANOTHER UNKNOWN ACFT TO ATC SINCE IT DID NOT SHOW A RADAR RETURN. RPTR NOTED THAT THE XPONDER OF THE OTHER ACFT WAS INTERMITTENT.
Narrative: SAAB340, WE WERE BEING VECTORED FOR APCH TO BOSTON. WITH NO PREVIOUS TFC CAUTION, WE RECEIVED A TCASII RA TO CLB WITH AN AIRPLANE 200 FT BELOW US AND LESS THAN 1/2 MI AWAY. THE REPLY FROM THE OTHER ACFT'S XPONDER APPEARED INTERMITTENT AND ATC HAD NO RADAR REPLY FROM THAT ACFT.
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.