Boeing Company Undifferentiated or Other Model
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 3.4
Situational Awareness; Distraction
Conflict Airborne Conflict
Air Traffic Control Provided Assistance; Air Traffic Control Issued New Clearance; Flight Crew Took Evasive Action
Airspace Structure; Human Factors; Airport
Aircraft X was on the RWY 10L ILS at 013 [heading]; and Aircraft Y was indicating 010 [heading] in the left downwind for RWY 08 at VUO which is underneath about a 3 mile final for RWY 10L. I called traffic to both pilots; but Aircraft X got a TCAS RA and started to climb. The pilot of Aircraft X advised that he was going around because he got an RA and was too close to Aircraft Y. On Aircraft X's 2nd approach to the airport; Aircraft Y was in a similar location as Aircraft X approached VUO airport; but was able to land. This all happened because of the close proximity of VUO airport to the final for RWY 10L at PDX. Our arrivals and traffic at VUO are at very similar altitudes in the vicinity of UAO.Three things I would recommend are to:A. Put a control tower at VUO airport.B. Restrict pattern work at VUO airport.C. Close VUO airport.
Portland Tower Controller reported an unsafe situation related to an aircraft inbound to Portland and one inbound to Pearson Field that resulted in an RA and a go around.