Pilot Reported To The Air Traffic Controller That He Had A Door That Had “Popped Open,” Analysis: Shortly after takeoff, the pilot reported to the air traffic controller that he had a door that had “popped open,” and the controller cleared the flight to return for landing. A review of ADS-B data and surveillance video revealed that, while the airplane was on the base leg for the approach back to the departure airport, it entered a steep, nose-down descent while rolling to the right, consistent with an aerodynamic stall/spin. Postaccident examination of the airplane revealed that both of the airplane’s doors (the rear baggage door and the main cabin door) remained attached to the airframe.