Primary finding
Probable cause
The pilot’s exceedance of the airplane’s critical angle of attack while maneuvering at low altitude, which resulted in an aerodynamic stall; loss of airplane control; and impact with terrain.
Investigator assessment
Analysis narrative
The pilot reported that after dropping a package while on a low pass, the airplane encountered an aerodynamic stall, contacted brush and trees, and impacted the ground. The airplane came to rest inverted, causing substantial damage to the empennage, elevator, and rudder. The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation.