Small Transport
Flight Crew Multiengine; Flight Crew Flight Instructor; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Flight Crew Last 90 Days 89; Flight Crew Total 8500; Flight Crew Type 1500
Communication Breakdown
Conflict NMAC; Conflict Ground Conflict; Less Severe; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Published Material / Policy
Aircraft Equipment Problem Dissipated; Flight Crew Took Evasive Action
Human Factors
I was doing training with the Aircraft X in the right hand seat as flight instructor; left hand seat occupied by experienced skydive pilot. During the final of the first touch and go of his session of 3L heard the Aircraft Y on the frequency asking landing information. I gave him 3L in use with right hand circuit and 2 aircraft doing touch and go training. When coming in right downwind again Runway 3L we got a traffic warning on the GPS screen. Traffic appeared to be head on 200 feet above. PIC didn't see it but I spotted the traffic head on almost same altitude and called the conflicting traffic to warn him being opposite in the downwind head on. He replied to join right downwind 3L. As PIC still couldn't see the traffic and a collision was going to happen I took the yoke and turned the aircraft to the right with a slight down input. Conflicting aircraft never saw us neither did any avoidance maneuver.PIC had back the controls and we did a second touch and go. Meanwhile the Aircraft Y joined the right downwind 3L and landed when we where again end of downwind. Turning on final for full stop ( final call was done) the Aircraft Y reported entering back track 3L. Being surprised as we where already on final I saw he could however vacate heaving 3 taxiways ahead. Nevertheless the pilot of the Aircraft Y called us that we better did a go-around as they would not be able to vacate in time. I replied that his behavior was very unprofessional; first positioning his aircraft opposite ours in a downwind leg and then entering and blocking the active runway with an aircraft on final. After we landed and shut down the aircraft I expected at least that the PIC of the Aircraft Y would come to apologize; but no one came to us. When checking the airport register I also noticed he never registered his inbound nor outbound flight.  When checking FlightRadar24 you can clearly see that the Aircraft Y flew opposite the downwind descending through 1;700 feet of the 03L to do a 180 turn to join his opposite track. The Aircraft X is at the same moment at 1;500 feet flying correct downwind position for the 3L. Closing speed was around 250 kts.
Flight Instructor reported an NMAC event with during landing training followed by a ground conflict with same aircraft operating in a nonstandard manner.