PA-34-200 Seneca I
Flight Crew Flight Instructor; Flight Crew Commercial; Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 300; Flight Crew Total 1100; Flight Crew Type 150
Situational Awareness
Conflict NMAC
Flight Crew Became Reoriented; Flight Crew Executed Go Around / Missed Approach; Flight Crew Took Evasive Action
Human Factors
We were in the left traffic pattern for runway 36 at DTO. This was a training flight in [a] Seneca and my student told tower that he had our traffic in sight; but was tracking the wrong plane. We were on left downwind turning base and came within 500 feet of another aircraft on a 2 mile final for runway 36. We turned out to the right and went around to avoid the other aircraft. Our plane was not equipped with TCAS or any traffic advisory system.
PA-34 Instructor Pilot reported an NMAC in the pattern at DTO.