Small Aircraft; Low Wing; 1 Eng; Fixed Gear
Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Commercial; Flight Crew Flight Instructor
Flight Crew Last 90 Days 100; Flight Crew Total 1650; Flight Crew Type 1000
Communication Breakdown
Conflict NMAC
Flight Crew Took Evasive Action
Human Factors
Aircraft Y was flying through established practice areas at 7;500 feet; flying various heading changes affecting other aircraft in the area. we adjusted course to avoid the traffic accordingly and the aircraft then turned around to a heading that would lead to a converging conflict. Our aircraft was to the right and proceeded with caution keeping an eye on the aircraft in case they made yet another heading change; they did not. we started to alter course to the right in order to maintain our general direction of flight but also resolve the converging conflict. The aircraft was not transmitting on the local frequency and not responding to radio queries. The aircraft never deviated course at any point. Had we not seen the aircraft and taken evasive action the conflict would not have been resolved.
GA pilot reported that another aircraft in the practice area was not transmitting on the local frequency and was making heading changes that required the pilot to take evasive action.