Learjet 35
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 2
Situational Awareness
ATC Issue All Types; Conflict Airborne Conflict
Air Traffic Control Provided Assistance
Airspace Structure; Human Factors
In only one session. I had 3 aircraft on approach at BFI airport respond to TCAS RA because of VFR aircraft climbing through the BFI final out of RNT airport. RNT airport sits 3-4 miles north of the initial approach fix for the ILS Runway 32L for BFI; but the SEA Class Bravo in the area is 030-100. The crossing altitude for the initial approach fix (LACKR) is 026. This encourages numerous VFR aircraft to fly out of RNT; climbing to 025 directly in the path of arriving traffic to BFI descending to 026 and lower.I recommend a redesign of the SEA Class B airspace to encompass more of the BFI final. This is a safety issue in both north and south flow configurations. It is impossible to anticipate what a VFR aircraft will do in response to seeing a fast moving jet descending right at him. If my jet responds to a TCAS RA; there is a high probability he will conflict with IFR traffic into; or out of SEA as well. I strongly feel this is a ticking time bomb and it's just a matter of time before something catastrophic happens. It is one of the most dangerous situations I've handled in my career; and it happened to me 3 times in one session and continues all spring--summer--fall. Something needs to change. The sooner the better.
Seattle TRACON Controller reported issues relating to the VFR traffic in and around Boeing Field and the Renton airport.