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B737-200 aircraft on approach in deteriorating WX had intruder helicopter encroach on approach path resulting in TCASII RA and evasive action.
| Attributes | |
| ACN | 381900 |
| Time | |
| Date | 199709 |
| Day | Fri |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : bfi |
| State Reference | WA |
| Altitude | msl bound lower : 1000 msl bound upper : 1000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tower : bfi |
| Operator | common carrier : air carrier |
| Make Model Name | B737-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other descent : approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Helicopter |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise other descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 130 flight time total : 13000 flight time type : 9000 |
| ASRS Report | 381900 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | conflict : nmac inflight encounter : weather non adherence : clearance other spatial deviation |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 300 vertical : 200 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | other |
Narrative:
ATIS reported excellent WX (4000 ft plus ceilings, visibility 10+ mi). During approach, WX deteriorated rapidly with squalls (fast moving in area). Moderate to heavy rain on approach with +/-20 KT wind shears from OM on glide path. Tower reported no significant WX. Tower reported helicopter on approach to airfield which was to remain east of airfield final approach. TCASII depicted traffic which seemed to drift towards our final approach. We were on course and glide path. At approximately 2 1/2 - 3 NM between 700-1000 ft. TCASII depicted traffic nearly superimposed on our aircraft symbol (solid red square with -2 (200 ft below). TCASII issued audible resolution alert (RA). I had to break off approach and climb. Once clear of traffic we broke out of WX, saw airport and landed visually. Filed near midair collision report with boeing tower.
Original NASA ASRS Text
Title: B737-200 ACFT ON APCH IN DETERIORATING WX HAD INTRUDER HELI ENCROACH ON APCH PATH RESULTING IN TCASII RA AND EVASIVE ACTION.
Narrative: ATIS RPTED EXCELLENT WX (4000 FT PLUS CEILINGS, VISIBILITY 10+ MI). DURING APCH, WX DETERIORATED RAPIDLY WITH SQUALLS (FAST MOVING IN AREA). MODERATE TO HVY RAIN ON APCH WITH +/-20 KT WIND SHEARS FROM OM ON GLIDE PATH. TWR RPTED NO SIGNIFICANT WX. TWR RPTED HELI ON APCH TO AIRFIELD WHICH WAS TO REMAIN E OF AIRFIELD FINAL APCH. TCASII DEPICTED TFC WHICH SEEMED TO DRIFT TOWARDS OUR FINAL APCH. WE WERE ON COURSE AND GLIDE PATH. AT APPROX 2 1/2 - 3 NM BTWN 700-1000 FT. TCASII DEPICTED TFC NEARLY SUPERIMPOSED ON OUR ACFT SYMBOL (SOLID RED SQUARE WITH -2 (200 FT BELOW). TCASII ISSUED AUDIBLE RESOLUTION ALERT (RA). I HAD TO BREAK OFF APCH AND CLB. ONCE CLR OF TFC WE BROKE OUT OF WX, SAW ARPT AND LANDED VISUALLY. FILED NMAC RPT WITH BOEING TWR.
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.