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A B757 flight crew is alerted to unrpted traffic by TCASII and climbs in response to the RA while about 16 mi west of st thomas, vi, tist, first officer.
| Attributes | |
| ACN | 459791 |
| Time | |
| Date | 200001 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | intersection : punta |
| State Reference | FO |
| Altitude | msl bound lower : 4000 msl bound upper : 5000 |
| Environment | |
| Flight Conditions | Mixed |
| Weather Elements | other |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : 10 other |
| Flight Phase | descent : vacating altitude |
| Route In Use | arrival : on vectors enroute : atlantic |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : vacating altitude |
| Route In Use | arrival : on vectors enroute : on vectors enroute : atlantic |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 459791 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument pilot : multi engine |
| Events | |
| Anomaly | conflict : nmac non adherence : required legal separation non adherence : published procedure |
| Independent Detector | aircraft equipment : tcas other controllera other flight crewa |
| Resolutory Action | controller : issued new clearance controller : separated traffic flight crew : took evasive action |
| Miss Distance | horizontal : 6000 vertical : 150 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance ATC Human Performance Airspace Structure |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
ATC facility: sju approach. Location: approximately 10 mi west of punta. Being vectored for ILS runway 10 at stt, we were heading 130 degrees, descending to 2200 ft with clearance to intercept localizer. At approximately 4500 ft, TCASII issued a TA. Traffic was 12 O'clock position, about 500 ft below, descending. TCASII almost immediately issued RA calling for 1500 ft climb. Almost simultaneously, approach issued a turn instruction to the other traffic. We were then issued a turn to 100 degrees. Passing 5000 ft and heading 100 degrees, we were issued clear of conflict by TCASII. We received new approach clearance and landed uneventfully. Due to cloud cover, we never did see the other traffic. He did report seeing us about 200 ft above his level. Our TCASII indicated 100 ft clearance. We did not get the call sign of the other traffic. We believe he was going to sju. Traffic's first appearance on TCASII was about 500 ft below at a range of 1-2 mi. Our TCASII was set to below and 10 mi range. For the second time in 1 week, TCASII has saved the day.
Original NASA ASRS Text
Title: A B757 FLC IS ALERTED TO UNRPTED TFC BY TCASII AND CLBS IN RESPONSE TO THE RA WHILE ABOUT 16 MI W OF ST THOMAS, VI, TIST, FO.
Narrative: ATC FACILITY: SJU APCH. LOCATION: APPROX 10 MI W OF PUNTA. BEING VECTORED FOR ILS RWY 10 AT STT, WE WERE HDG 130 DEGS, DSNDING TO 2200 FT WITH CLRNC TO INTERCEPT LOC. AT APPROX 4500 FT, TCASII ISSUED A TA. TFC WAS 12 O'CLOCK POS, ABOUT 500 FT BELOW, DSNDING. TCASII ALMOST IMMEDIATELY ISSUED RA CALLING FOR 1500 FT CLB. ALMOST SIMULTANEOUSLY, APCH ISSUED A TURN INSTRUCTION TO THE OTHER TFC. WE WERE THEN ISSUED A TURN TO 100 DEGS. PASSING 5000 FT AND HDG 100 DEGS, WE WERE ISSUED CLR OF CONFLICT BY TCASII. WE RECEIVED NEW APCH CLRNC AND LANDED UNEVENTFULLY. DUE TO CLOUD COVER, WE NEVER DID SEE THE OTHER TFC. HE DID RPT SEEING US ABOUT 200 FT ABOVE HIS LEVEL. OUR TCASII INDICATED 100 FT CLRNC. WE DID NOT GET THE CALL SIGN OF THE OTHER TFC. WE BELIEVE HE WAS GOING TO SJU. TFC'S FIRST APPEARANCE ON TCASII WAS ABOUT 500 FT BELOW AT A RANGE OF 1-2 MI. OUR TCASII WAS SET TO BELOW AND 10 MI RANGE. FOR THE SECOND TIME IN 1 WK, TCASII HAS SAVED THE DAY.
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.