The FIA International Court of Appeal (ICA) has rejected protests against the diffusers used by the Brawn, Toyota and Williams teams, after concluding that their ‘double decker’ designs comply with the 2009 regulations.

BMW Sauber, Ferrari, Red Bull and Renault had all questioned the legality of the diffusers, but following Tuesday’s hearing in Paris, the ICA decided that race stewards in Australia and Malaysia had made the right call in declaring them legal.

Full statement from the FIA: 
The FIA International Court of Appeal has decided to deny the appeals submitted against decisions numbered 16 to 24 taken by the Panel of the Stewards on 26 March at the 2009 Grand Prix of Australia and counting towards the 2009 FIA Formula One World Championship. 

Based on the arguments heard and evidence before it, the Court has concluded that the Stewards were correct to find that the cars in question comply with the applicable regulations.

Full reasons for this decision will be provided in due course.

Source - The Official Formula 1 Website

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Protest lodged over Brawn, Toyota and Williams diffusers

The much-talked-about diffuser designs on the Brawn GP, Toyota and Williams cars have become the subject of an offical protest from rivals in Melbourne, after they cleared Thursday scrutineering with the Albert Park stewards.

All three teams are believed to have found a loophole in the regulations which allows them to run a taller diffuser. However, four fellow teams - BMW Sauber, Ferrari, Red Bull and Renault - have objected, questioning the legality of the designs.

The stewards must now decide whether to allow the cars in question to race in their current form. However, should there be any appeal over that decision, it would come down to the FIA to determine the diffusers’ legality, possibly at a later date.

Source - F1.com