Incident Overview
An airplane was observed by witnesses executing a rolling maneuver in flight. During this maneuver, the left wing separated from the aircraft. Subsequently, the airplane collided with trees. Witnesses reported that the pilot had performed acrobatic maneuvers in the same airplane on prior occasions.
Flight Manual Restrictions
The airplane's flight manual explicitly prohibits intentional acrobatic maneuvers. Despite this restriction, the pilot engaged in aerobatic flight.
Wing Structure Examination
Following the accident, investigators examined the wing spar and support structures. No evidence of corrosion or material fatigue was found in these components.
Probable Cause
The official probable cause is the fracture and separation of the airplane wing, and the subsequent loss of control and collision with trees, as a result of the pilot's repeated performance of acrobatic maneuvers, which exceeded the design limits of the airplane.