The National Transportation Safety Board says the plane that crashed at the Reno Air Races last year had been altered but had not been tested to see how it would hold up under race conditions. The report says the failure of a screw and nut assembly caused a chain reaction that sent the plane out of control during a race.
Earlier this year, the NTSB recommended airplane owners have any major modifications to their planes evaluated before they can race. Mike Houghton with the Reno Air Races says he is glad to see more safety standards, "If any changes are made that are major modifications, it's been recommended and we're implementing systems of checks and balances of reporting and testing."
The NTSB also recommended moving races with planes like the one that crashed and fuel trucks farther away from spectators.