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Flight crew of a BE1900 stopped descent in response to a TCASII traffic callout and then observed a single engine piper aircraft cross underneath them at the altitude to which they were assigned on descent.
| Attributes | |
| ACN | 508073 |
| Time | |
| Date | 200104 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : bos.airport |
| State Reference | MA |
| Altitude | msl single value : 6700 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : a90.tracon |
| Operator | common carrier : air taxi |
| Make Model Name | Beech 1900 |
| Operating Under FAR Part | Part 135 |
| Flight Phase | descent : approach |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : a90.tracon |
| Operator | general aviation : personal |
| Make Model Name | Piper Single Undifferentiated or Other Model |
| Operating Under FAR Part | Part 91 |
| Person 1 | |
| Affiliation | company : air taxi |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 200 flight time total : 2750 flight time type : 600 |
| ASRS Report | 508073 |
| Person 2 | |
| Affiliation | company : air taxi |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne critical non adherence : required legal separation |
| Independent Detector | aircraft equipment : tcas other flight crewa other flight crewb |
| Resolutory Action | flight crew : took precautionary avoidance action |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | other |
Narrative:
We were on a descent from 9000 ft to 6000 ft, assigned heading 175 degrees, vectors for runway 4L visual approach. At approximately 6700 ft, we received a 'traffic, traffic' callout from TCASII. Ours does not give RA's. After glancing over at the TCASII, located only on captain's side, I leveled the aircraft momentarily until we had a visual on the aircraft. It was a single engine piper, apparently level according to the TCASII, at 6000 ft, crossing from right to left. After watching the aircraft pass off to the left, I continued our descent to 6000 ft. We did not query ATC as to why there was no advisory given, only to his initials. We were on with bos approach 118.25, just prior to going to 126.50 at approximately XA53 in apr/01. The controller was working other aircraft, but did not appear to be overwhelmed/overloaded.
Original NASA ASRS Text
Title: FLC OF A BE1900 STOPPED DSCNT IN RESPONSE TO A TCASII TFC CALLOUT AND THEN OBSERVED A SINGLE ENG PIPER ACFT CROSS UNDERNEATH THEM AT THE ALT TO WHICH THEY WERE ASSIGNED ON DSCNT.
Narrative: WE WERE ON A DSCNT FROM 9000 FT TO 6000 FT, ASSIGNED HDG 175 DEGS, VECTORS FOR RWY 4L VISUAL APCH. AT APPROX 6700 FT, WE RECEIVED A 'TFC, TFC' CALLOUT FROM TCASII. OURS DOES NOT GIVE RA'S. AFTER GLANCING OVER AT THE TCASII, LOCATED ONLY ON CAPT'S SIDE, I LEVELED THE ACFT MOMENTARILY UNTIL WE HAD A VISUAL ON THE ACFT. IT WAS A SINGLE ENG PIPER, APPARENTLY LEVEL ACCORDING TO THE TCASII, AT 6000 FT, XING FROM R TO L. AFTER WATCHING THE ACFT PASS OFF TO THE L, I CONTINUED OUR DSCNT TO 6000 FT. WE DID NOT QUERY ATC AS TO WHY THERE WAS NO ADVISORY GIVEN, ONLY TO HIS INITIALS. WE WERE ON WITH BOS APCH 118.25, JUST PRIOR TO GOING TO 126.50 AT APPROX XA53 IN APR/01. THE CTLR WAS WORKING OTHER ACFT, BUT DID NOT APPEAR TO BE OVERWHELMED/OVERLOADED.
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.