Small Aircraft; Low Wing; 1 Eng; Retractable Gear
Communication Breakdown; Situational Awareness
ATC Issue All Types; Conflict NMAC
Air Traffic Control Issued Advisory / Alert; Flight Crew Became Reoriented; Flight Crew Executed Go Around / Missed Approach; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Took Evasive Action
Aircraft; Procedure; Airspace Structure; Human Factors
Aircraft X was on an ILS Approach. On initial contact I cleared them for the option and issued traffic stating that targets were likely to merge. Aircraft X advised traffic in sight and I asked if it was a helicopter or a plane. They stated a plane. At that time Aircraft Y called on frequency stating that they were the traffic that Aircraft X had in sight and were going to be flying around the area. The flight paths had crossed and I went back to my other traffic. During that time Aircraft Y made a climbing right turn back into Aircraft X. Aircraft X reported that they were in a climb to avoid Aircraft Y.I would issue a beacon code and identify the secondary aircraft to control his actions.
We were shooting the ILS Approach. During our approach; Tower pointed out traffic to us at 1 o'clock west bound 500 feet below us. We had him it sight and it crossed in front of us still 500 feet below. It looked as if it was continuing west bound and I lost sight of it due to the wing. As the instructor in the left seat I didn't think much of it. We continued our descent down on glide path and while we were descending the mfd calls out traffic 10 o'clock less than a mile same altitude. I look out to our left and it is the same aircraft that had passed underneath us a few moments earlier. It was what looked to be 200-300 feet ahead and to our left same altitude on a direct collision course. I immediately took flight controls and started an evasive full power climb to miss him. We probably crossed over him about 100-200 feet. We were right on the edge of the Class Delta airspace when this happened and Tower never issued us a secondary traffic call when he turned back around.
A Local controller and inbound instructor pilot reported a near mid air collision with an aircraft maneuvering into the path of an the aircraft conducting an ILS Approach.