PA-28 Cherokee/Archer/Dakota/Pillan/Warrior
Flight Crew Flight Instructor; Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Commercial
Flight Crew Total 960
Situational Awareness
Conflict NMAC; Deviation / Discrepancy - Procedural Published Material / Policy
General None Reported / Taken
Human Factors
As my student and I where approaching ZZZ airport Aircraft Y passed behind us possibly closer than 500 feet separation.They were approaching from the right and were descending. However; they adjusted course to pass behind us.We were on 6 mile final for ZZZ and at a lower altitude in communication with Tower. Aircraft Y was on a different frequency; most likely with Approach.I do not believe safety was compromised but am filling out a report because separation was close enough that is could be borderline for the regulations.
Instructor Pilot observed another aircraft passing 500 feet overhead and did not take any evasive action.