B737 Undifferentiated or Other Model
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 8
Situational Awareness
ATC Issue All Types; Conflict Airborne Conflict; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued New Clearance; Air Traffic Control Separated Traffic
Airport; Human Factors; Procedure
While I was working Final I was sequencing multiple aircraft to PDX including both base legs and straight in aircraft. While vectoring Aircraft Y for the ILS Approach I had to vector him around a VFR aircraft in the approach corridor. After vectoring him around that aircraft and vectoring him onto the final approach course his approach speed reduced by at least 50 knots. While this was going on I was vectoring Aircraft X for the visual approach to the parallel runway. I turned Aircraft X to a 30 degree intercept and while this was happening was when I realized that Aircraft Y's final approach speed had reduced dramatically. As Aircraft X was turning to final I lost standard separation.I recommend that the Portland Class Charlie extends to the east and west to avoid conflicts from VFR aircraft. I also need to use speed control more appropriately and not give up altitude separation between aircraft that I am sequencing to final.
P80 TRACON Controller reported losing separation between two in trail aircraft when the first aircraft was vectored off the approach to avoid unidentified VFR conflicting traffic.