Challenger Jet Undifferentiated or Other Model
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 1.3
Communication Breakdown; Situational Awareness
ATC Issue All Types; Conflict Airborne Conflict
Air Traffic Control Provided Assistance; Air Traffic Control Issued New Clearance; Air Traffic Control Issued Advisory / Alert; Air Traffic Control Separated Traffic; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Returned To Clearance
Procedure; Human Factors; Airspace Structure
Working satellite sector; MVFR; light traffic. Aircraft X on vectors for the ILS Runway 13R Approach to BFI. As I cleared Aircraft X for the approach I issued VFR traffic on a target east of the localizer heading westbound at 1700 feet. As Aircraft X approached the localizer the VFR target climbed up to 1800 feet. Unsure whether the VFR target would continue to climb; as they often do below the Class B; I canceled the approach clearance for Aircraft X and issued a heading of 180 degrees for traffic. I subsequently advised Aircraft X of the position of the airport and they reported the field in sight and were cleared for the Visual Approach. Aircraft X landed without further incident.This is another report of a continued problem within our airspace.Something needs to change. The VFR aircraft are transiting a very narrow; busy corridor of airspace and are doing so without any communication with ATC. It is simply unsafe. The VFR aircraft in this area at the very least need to be in communication with ATC so that we can assign; as necessary; altitude restrictions ensuring the safety of all the aircraft involved. The solutions are not hard and while they are potentially more restrictive to VFR aircraft the bottom line is that what happens day in and day out in that airspace as it exists and operates now will eventually result in a very bad accident.
An ATC Controller reported a VFR aircraft not receiving services crossed the ILS Runway 13R final approach course for an airport while a jet aircraft was conducting an ILS approach. ATC vectored the aircraft off the approach clearance to separate the traffic. Reporter states this is a recurring issue in this airspace.