Beech M35 N9CB accident near Amery, Wisconsin

Probable cause

The pilot’s loss of airplane control while maneuvering with the airplane near its maximum gross weight, which resulted in the airplane exceeding its critical angle-of-attack and entering an aerodynamic stall.

NTSB analysis

The private pilot departed for a personal flight with three passengers in a single-engine airplane near its maximum takeoff weight. About 7 miles northeast of the departure airport, several witnesses noticed the airplane maneuvering. One witness described the airplane in a steep climb, then "making a circle, and then twisting" before dropping nose down and disappearing behind a tree line. Another witness reported seeing the airplane in a nose-down attitude with its wings rocking back and forth. Three other witnesses noticed the airplane spinning before impact. The airplane impacted an open wheat field with a nose-down attitude and low forward velocity, consistent with an aerodynamic stall. Examination of the airframe and engine revealed no evidence of mechanical malfunctions or failures that would have precluded normal operation.

Text from the NTSB. Open the NTSB docket for CEN15FA320 for the full record.