The most serious incident of the afternoon involved 1925 winner Peter DePaolo. During his qualifying attempt, going into turn three on the first lap, the car went out of control, and flipped over at least three times. DePaolo was thrown from the vehicle, then the car slid upside down along the bricks, ripping off the engine cowling, shearing off the carburetor, and grinding the top of the supercharger casing. The car suffered a bent rear axle, a dented nose, and other minor damage. It was determined that the crash was caused by the steering mechanism locking up. DePaolo suffered gouges to his arms, bruised legs, and cuts on his chin. Though DePaolo escaped serious injuries, he was sidelined for the remainder of the month. After the crash, the team led by chief mechanic Collon Henning Peters began repairing the car, in hopes of still qualifying with another driver.