Portland tower controller reported an unsafe situation related to an aircraft inbound to portland an...

Attributes
ACN	1598280
Time
Date	201811
Local Time Of Day	0001-0600
Place
Locale Reference	PDX.Tower
State Reference	OR
Aircraft 1
Make Model Name	Boeing Company Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Descent
Route In Use	Other Instrument Approach
Flight Plan	IFR
Aircraft 2
Make Model Name	Cessna Aircraft Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	Other VFR traffic pattern
Route In Use	None
Flight Plan	VFR
Person 1
Function	Local
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 3.4
Events
Anomaly	Conflict Airborne Conflict

Narrative:

Aircraft X was on the runway 10L ILS at 013 [heading]; and aircraft Y was indicating 010 [heading] in the left downwind for runway 08 at vuo which is underneath about a 3 mile final for runway 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 runway 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.

Original NASA ASRS Text

Title: 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.

Narrative: 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.

Data retrieved from NASA's ASRS site 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.

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.