What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
This incident occurred at the Reno air races. Subsequent to engine maintenance, a test flight was performed. During takeoff, and engine overspeed condition occurred. An emergency landing was performed without further incident. Disassembly and inspection indicates the experimental propeller governor flyweight hinge bearings allow excessive flyweight movement during high power operations.
As the FAA filed it
THIS INCIDENT OCCURRED AT THE RENO AIR RACES. SUBSEQUENT TO ENGINE MAINTENANCE, A TEST FLIGHT WAS PERFORMED. DURING TAKEOFF, AND ENGINE OVERSPEED CONDITION OCCURRED. AN EMERGENCY LANDING WAS PERFORMED WITHOUT FURTHER INCIDENT. DISASSEMBLY AND INSPECTION INDICATES THE EXPERIMENTAL PROPELLER GOVERNOR FLYWEIGHT HINGE BEARINGS ALLOW EXCESSIVE FLYWEIGHT MOVEMENT DURING HIGH POWER OPERATIONS.