Loose drain cover caused Barrichello crash

Williams and the FIA suspect that a loose drain cover caused Rubens Barrichello's high speed crash during the Monaco grand prix.

The team's technical director initially diagnosed a rear suspension failure.

"We have a good idea which part is suspect, but to be completely sure, we need to await the results of materials tests back at the factory," Sam Michael said earlier this week.

Germany's Auto Motor und Sport now reports that FIA experts conducted an investigation and now think a loose drain cover damaged the left rear wheel.