A320
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 2.0
Communication Breakdown; Situational Awareness
ATC Issue All Types; Conflict Airborne Conflict; Deviation - Speed All Types; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued Advisory / Alert; Air Traffic Control Separated Traffic; Air Traffic Control Issued New Clearance; Flight Crew Executed Go Around / Missed Approach
Procedure; Human Factors; Airspace Structure
Aircraft Y was in front of pack of planes for an ILS approach; Aircraft X was on downwind to base; Aircraft Z was straight in approach. Similar sounding call signs created a bit of confusion at the beginning. I had appropriate separation at the final approach fix with Aircraft Y and Aircraft X. I did however assign 190 knots to Aircraft X and forgot to relinquish the speed control; prior to transferring the aircraft to the tower. Aircraft Y slowed to a slower than normal speed inside the Final Approach Fix. The closest point was 1.81 miles; Tower was providing visual separation. The tower sent the Aircraft X around after ADSB-X alert. For an unknown reason the crew of Aircraft X advised the tower of a near mid-air situation. I am not aware of any aircraft in a close proximity to Aircraft X.
A90 TRACON Controller allowed spacing between two aircraft on final approach to decrease to less than required minimums.