Circumstances
According to statements from all three individuals on board, the flight was conducting a training exercise near Paso Robles Airport. Upon arriving in the vicinity of the airport at approximately 5,800 feet above the airport, the instructor shut down the engine to simulate an engine failure. The pilot being trained was instructed to glide the aircraft to a safe landing at the airport.
Sequence of Events
During the simulated emergency descent, the pilot being trained asked several times if the landing gear should not be extended until the turn from base to final was being made. The witnesses aboard the aircraft stated that on short final, at a very low altitude, the gear was lowered using the emergency gear extension procedure. The left main landing gear did not fully extend and lock into position prior to the aircraft touching down on the runway.
Aftermath
On touchdown, the left main gear collapsed, causing the left wing to collide with the runway. No other details were provided in the source.