Skyhawk 172/Cutlass 172
Flight Crew Instrument; Flight Crew Flight Instructor; Flight Crew Commercial
Flight Crew Last 90 Days 90; Flight Crew Total 1300; Flight Crew Type 200
Communication Breakdown; Training / Qualification; Situational Awareness
Conflict NMAC; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Took Evasive Action
Airspace Structure; Human Factors
I was in the traffic pattern in a C172 with a student pilot; teaching pattern work. I announced 45 degree entry to right downwind Runway XX at ZZZ. When we reached the downwind leg; I announced downwind leg. I was startled to hear from Aircraft Y that he too was downwind Runway XX. I immediately asked him to state your position. He said he was over the freeway. The freeway is about 3 miles from the runway. I told him that the freeway was not in the pattern.Moments later; once abeam the numbers to Runway XX; I was startled to see Aircraft Y go directly underneath us toward the runway; then make a 360 and join the pattern below us.I asked him: 'Aircraft Y; what are you doing?' He said; 'I saw you in the pattern so I decided to go below you.' This is highly unsafe practice. He nearly collided with us. Later; he landed on Runway XX while we were still on the runway in our landing roll. Someone should reach out to this pilot and provide remedial training. A FAA report has been filed.
Flight instructor reported that while on the downwind leg of the traffic pattern; another aircraft flew directly below the instructor's aircraft; performed a 360-degree turn and joined the pattern. That aircraft then proceeded to land on the runway while the instructor was on the landing roll.