Medium Large Transport
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 11.0
Confusion; Distraction; Situational Awareness
ATC Issue All Types; Airspace Violation All Types; Conflict Airborne Conflict; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued Advisory / Alert; Air Traffic Control Issued New Clearance; Flight Crew Executed Go Around / Missed Approach
Procedure; Human Factors; Airspace Structure; Company Policy
Aircraft X was executing a go around due to a possible bird strike on the preceding arrival. I turned Aircraft X back into a downwind; and manually coordinated with final that he was level at 3000 feet due to Aircraft Y crossing the airport westbound at 4000 feet. Finals would need to climb Aircraft X when he was clear of traffic to ensure separation with the BFI final at 2200 feet. I called the traffic to Aircraft X and turned him northbound into the downwind. I coordinated a point out off of the landline to the BFI arrival controller on Aircraft X. At the same time I was doing the manual point out; I saw Aircraft Y appeared to be in a descent. I turned Aircraft X to a 250 heading; asked him to expedite; and displayed his data block on the satellite controller's scope. I called satellite and asked them to turn their traffic northbound.The complexity around SEATAC and Boeing creates a number of problems. Aircraft Y had been displayed but not pointed out to the Arrival D controller. It is not clear if they had been pointed out to finals; and satellite had assumed the aircraft had been pointed out; giving him control for descent. I don't have a specific airspace recommendation. The satellite controller had told me later he thought Aircraft X was a departure; not a go around; and would be climbing above his traffic.
S46 TRACON Controller reported a loss of separation due to confusing coordination and complex airspace between adjacent airports.