Narrative:

Approaching on BT6 025 degree radial 29 DME fix, first officer was flying level at 10000 ft, slowing to 210 KTS at pdx TRACON's request. I noticed traffic approaching on TCASII display but was not too concerned. The traffic was never mentioned by ATC, in spite of the fact that we were closing with it. The TCASII sounded 'traffic, traffic' but neither one of us could see it. At about the time I saw the merging traffic, the display turned red and annunciated 'descend, descend.' first officer immediately closed the throttles and began a descent. The high wing, light aircraft flew over us by about 400 ft. There were also a line check airman and an FAA acdp inspector on board, both of them observed the entire scenario. First officer response was both timely and appropriate. Only mins later, while on final approach to runway 10R at pdx, a second TCASII alert changed to warning resulting in a pullup, while we were descending from the final approach fix inbound. This was caused by an aircraft at a small airport to the immediate northwest flying a traffic pattern over the river. The horizontal flight patterns overlapped. We were too close to the other aircraft, and the vertical avoidance maneuver --- particularly when one has been flying all night from the orient -- resulted in something less than what is considered a stable approach.

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Original NASA ASRS Text

Title: WDB ON ARR FROM OCEANIC FLT HAS TCASII RA TO DSND. DOES SO. CONTINUING ON APCH HAS SECOND TCASII ALERT TO PULLUP.

Narrative: APCHING ON BT6 025 DEG RADIAL 29 DME FIX, FO WAS FLYING LEVEL AT 10000 FT, SLOWING TO 210 KTS AT PDX TRACON'S REQUEST. I NOTICED TFC APCHING ON TCASII DISPLAY BUT WAS NOT TOO CONCERNED. THE TFC WAS NEVER MENTIONED BY ATC, IN SPITE OF THE FACT THAT WE WERE CLOSING WITH IT. THE TCASII SOUNDED 'TFC, TFC' BUT NEITHER ONE OF US COULD SEE IT. AT ABOUT THE TIME I SAW THE MERGING TFC, THE DISPLAY TURNED RED AND ANNUNCIATED 'DSND, DSND.' FO IMMEDIATELY CLOSED THE THROTTLES AND BEGAN A DSCNT. THE HIGH WING, LIGHT ACFT FLEW OVER US BY ABOUT 400 FT. THERE WERE ALSO A LINE CHK AIRMAN AND AN FAA ACDP INSPECTOR ON BOARD, BOTH OF THEM OBSERVED THE ENTIRE SCENARIO. FO RESPONSE WAS BOTH TIMELY AND APPROPRIATE. ONLY MINS LATER, WHILE ON FINAL APCH TO RWY 10R AT PDX, A SECOND TCASII ALERT CHANGED TO WARNING RESULTING IN A PULLUP, WHILE WE WERE DSNDING FROM THE FINAL APCH FIX INBOUND. THIS WAS CAUSED BY AN ACFT AT A SMALL ARPT TO THE IMMEDIATE NW FLYING A TFC PATTERN OVER THE RIVER. THE HORIZ FLT PATTERNS OVERLAPPED. WE WERE TOO CLOSE TO THE OTHER ACFT, AND THE VERT AVOIDANCE MANEUVER --- PARTICULARLY WHEN ONE HAS BEEN FLYING ALL NIGHT FROM THE ORIENT -- RESULTED IN SOMETHING LESS THAN WHAT IS CONSIDERED A STABLE APCH.

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.