Pilot Report
The pilot stated that during the landing roll, the left brake locked up, causing the airplane to pull to the left. The pilot attempted to compensate with the right brake, but the left brake continued to pull harder to the left. Eventually, the right brake also locked up, causing the airplane to flip upside down.
Mechanic Examination
An aircraft mechanic who examined the accident airplane reported that no mechanical malfunction was found with the brakes. The condition of the brakes, as inspected, did not reveal any defects or abnormalities that could explain the reported lock-up.
Discussion
The sequence of events, as described by the pilot, suggests a brake-related issue that led to a loss of directional control during landing. However, the post-accident examination by a mechanic did not identify any mechanical faults. The circumstances surrounding the brake lock-up remain unverified by physical evidence.