Skwentna, AK, USA
N99640
PIPER PA-18-135
The pilot stated that he was landing on an unimproved runway with calm winds. After landing, he applied brakes, but felt he needed more. When he increased brake pressure, the tail of the airplane rose, the prop struck the ground and the airplane flipped over, resulting in substantial damage to the rudder, vertical stabilizer and right lift strut. The pilot reported that there were no mechanical malfunctions or failures that would have precluded normal operation.
The pilot’s use of excessive braking which resulted in a nose-over.
Source: NTSB Aviation Accident Database
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