Primary finding
Probable cause
The pilot’s failure to recognize and avoid an obstacle on the runway environment during takeoff roll. Contributing was flat light conditions.
Investigator assessment
Analysis narrative
The pilot reported that, while on takeoff roll from a gravel airstrip, the airplane’s left main wheel struck a pile of gravel, resulting in a nose over. The airplane sustained substantial damage to the wings, horizontal stabilizer, and rudder. The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operations. The pilot added that flat light conditions, coupled with the gray silt ladened gravel, contributed to him not seeing the obstacle on the airstrip.