Ongoing suspicion from rival teams looks like to convince FIA technical delegate Charlie Whiting to re-open checks on Mercedes' controversial rear wing and DRS system.

The wing is thought to use the car's existing DRS system, specifically the movable section of the rear wing, to uncover a hole on the inside of the endplate, which then channels air to the front wing in search of extra performance.

Rival teams, notably Red Bull and Lotus, have claimed that, with the driver dictating when the DRS system is employed, the system contravenes rules concerning movable aerodynamic devices, but Whiting has repeatedly put forward the belief that there is nothing wrong with the concept, based on the fact that the hole remains partially uncovered when the wing is in its standard position. As such, he argues, it is difficult to determine that it is fully operated by the driver.

However, even though official protests have yet to materialise at either the Australian or Malaysian grands prix, Mercedes' rivals continue to lobby Whiting in a bid to have the system either outlawed or officially declared legal. The BBC now understands that those complaints will convince Whiting to use the three-week gap between the Malaysian and Chinese races to come to a decision, although even a positive verdict could lead to protests in Shanghai.

The system is reckoned to be worth up to half a second in qualifying, when Michael Schumacher and Nico Rosberg have the freedom to employ it at will, but is less effective in races where they are limited to defined DRS zones, which may help to explain the single point so far accrued by the Three-Pointed Star despite Schumacher having started on the second row at both of the two rounds held so far.



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