S46 TRACON controller reported an aircraft on an ILS approach had to be vectored off final to avoid ...

Attributes
ACN	1550767
Time
Date	201806
Local Time Of Day	1201-1800
Place
Locale Reference	S46.TRACON
State Reference	WA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Citation V/Ultra/Encore (C560)
Operating Under FAR Part	Part 91
Flight Phase	Final Approach
Route In Use	Other Instrument Approach
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Person 1
Function	Approach
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 10
Events
Anomaly	ATC Issue All Types Conflict Airborne Conflict Deviation - Procedural Published Material / Policy

Narrative:

Aircraft X was on a 110 heading to join bfi ILS at 2200 feet. We must go this low to stay beneath an adjacent airport's final approach course. We can't go lower due to noise abatement. A VFR target [aircraft Y] was observed on the localizer tracking outbound at 1500 feet. I continued monitoring it; observed the VFR slowly climbing. When the VFR kept climbing to 1800 feet; my trainee turned aircraft X to a 160 heading; cancelled approach clearance; and vectored until clear of VFR traffic. The trainee then turned and re-cleared aircraft X. Traffic was issued. This is so common. It happens with almost every arrival. There are VFR aircraft everywhere that no one is talking to. They like to track the localizer outbound at the localizer altitudes. We are constantly cancelling clearances; delay vectoring; issuing traffic alerts; having TCAS ras; and delaying airplanes to dodge these aircraft. It is so dangerous. We need a part 91 or a class C. The problem has only got worse. Almost every arrival is being delayed; unless it is a very IFR day.

Original NASA ASRS Text

Title: S46 TRACON Controller reported an aircraft on an ILS Approach had to be vectored off final to avoid unidentified VFR traffic.

Narrative: Aircraft X was on a 110 heading to join BFI ILS at 2200 feet. We must go this low to stay beneath an adjacent airport's final approach course. We can't go lower due to noise abatement. A VFR target [Aircraft Y] was observed on the localizer tracking outbound at 1500 feet. I continued monitoring it; observed the VFR slowly climbing. When the VFR kept climbing to 1800 feet; my trainee turned Aircraft X to a 160 heading; cancelled approach clearance; and vectored until clear of VFR traffic. The trainee then turned and re-cleared Aircraft X. Traffic was issued. This is so common. It happens with almost every arrival. There are VFR aircraft everywhere that no one is talking to. They like to track the localizer outbound at the localizer altitudes. We are constantly cancelling clearances; delay vectoring; issuing traffic alerts; having TCAS RAs; and delaying airplanes to dodge these aircraft. It is so dangerous. We need a part 91 or a class C. The problem has only got worse. Almost every arrival is being delayed; unless it is a very IFR day.

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.

S46 TRACON controller reported an aircraft on an ILS approach had to be vectored off final to avoid unidentified VFR traffic.