What happened
Following a normal landing, the aircraft was decelerating to approximately 20 miles per hour during the landing roll. During this phase, the brakes locked up, causing the aircraft to nose over and come to rest in an inverted position.
An investigation of the event revealed that the passenger, who was seated in the front seat, had placed their feet on the aircraft's brakes during the rollout. This action caused the sudden brake lock-up and subsequent inversion.
Findings
Both wings, the rudder, and the fuselage sustained substantial damage. The pilot noted that the accident could have been avoided if more thorough instructions had been provided to the passenger regarding the importance of keeping feet off the brake pedals during landing and taxiing.