NTSB

The flight instructor and student pilot’s inadequate preflight performance planning which resulted in a takeoff attempt with insufficient available runway, a loss of control, and impact with terrain.

The pilot’s loss of airplane control while maneuvering at a low altitude, which resulted in a collision with a house.

The pilot reported that he was about halfway home when the power loss occurred.

An in-flight separation of the control stick from the torque tube assembly, which resulted in a loss of directional control during the landing roll and subsequent on-ground collision.

The flight instructor’s improper decision to direct the student pilot to exit the airplane with the engine running, which resulted in serious injury when the student walked into the propeller arc.

The pilot’s failure to maintain adequate airspeed, which resulted in an aerodynamic stall and spin. Contributing to the accident was the failure of the pilot to perform an adequate preflight inspection, to include removal of the pitot tube cover.

An encounter with mountain wave turbulence and windshear that exceeded the climb capability of the airplane and resulted in impact with terrain.

The pilot’s inability to extend the main landing gear due to incomplete maintenance, which resulted in a partial wheels-up landing and the mechanic’s failure to follow proper maintenance procedures that led to the loss of main landing gear system hydraulic pressure and the subsequent failure of the main landing gear to fully extend.