Small Aircraft; Low Wing; 1 Eng; Fixed Gear
Flight Crew Flight Instructor
Situational Awareness
Conflict NMAC
Flight Crew Took Evasive Action
Human Factors
Flying at night on the arrival direct MOSLY; got a traffic alert from ATC that required evasive maneuvering. An Aircraft was northwestbound at 200 kts. descending through 3500 not talking to Indy. Instructor had to take control to prevent a midair collision. This was a high task saturated portion of the flight as the instructor was evaluating the Pilot's ability to load the arrival procedure and communicate with Indy approach. I could have divided my attention between the ADSB; evaluating and outside better.
Light aircraft Instructor Pilot reported a near mid-air collision with another light aircraft on arrival into IND.