Mercedes explains cause of radio glitch in Sakhir GP

Mercedes has explained how a previously unseen glitch in its radio messaging system triggered the pitstop chaos that cost George Russell a Formula 1 victory in the Sakhir Grand Prix.

Mercedes explains cause of radio glitch in Sakhir GP

Russell had led for much of the race on the Bahrain outer loop, but it all went wrong during a late safety car period that was called after Jack Aitken spun and hit the barriers at the final corner.

Mercedes called both Russell and teammate Valtteri Bottas in to switch to medium tyres, but amid confused messaging to the pit crew the wrong tyres were fitted.

The two front tyres put on Russell's car were from Bottas' set, which then forced the young Briton back in to the pits a lap later to fit his proper tyres.

Mercedes pinned the error down to a problem with the team radio system, and it has subsequently emerged that the issue revolves around how messages from the drivers and pit wall are prioritised.

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Andrew Shovlin, Mercedes' trackside engineering director, said the confusion was triggered by different conversations being broadcast when team and drivers were speaking at the same time.

"We haven't had enough time to get an absolute and thorough understanding of what went on, but we have found a smoking gun," he explained.

"That has to do with how the radio system prioritises messages. When for instance Ron [Meadows, sporting director] is calling out the crews and getting them to get the tyres ready for the two drivers, there were a number of broadcasts at that time on the radio system.

"The system knows to prioritise the messages coming from Ron, because the most important thing is the tyres are there: more so than whatever a driver says or whatever someone else in the crew might say.

"But it looks like there is a period whereby the system is deciding to let the prioritised message through, and we missed a key bit of the broadcast.

"[This meant] that half of the tyre collectors didn't get the message. And it looks like half of them did. Therefore we've got the cars coming in, and all the tyres are not ready in the pit lane."

Shovlin said that just by having half the pit crew unaware of what tyres needed to be fitted was enough to trigger the chaotic scenes as first Russell is sent out with the wrong front tyres, and then Bottas has to have his old set refitted because he does not have any new ones available.

"Obviously it looks like a sort of mess of us not really understanding what we're doing, but the issue all comes down to this sort of root cause where we lost a key message at a key point," he added.

"There was very little time between the safety car and George coming into the pits. We just need to go through all the logs of everything to see how that was working.

"And once we've got a complete understanding of that, and filled in a few of the blanks that we're not certain of at the moment, we can then look at a solution for the next race in Abu Dhabi."

Shovlin said that the previously unseen issue with the radio was something that could have emerged at any point, but it was unlucky for Russell it came at a crucial moment.

"This is something that could have caught us out in any of the past three years. And it could have caught us out at the first race next year.

"So it's something that's been there in the system. And it was awfully unfortunate for the drivers and desperately unfortunate for George that we found that."

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About this article

Series Formula 1
Event Sakhir GP
Teams Mercedes
Author Jonathan Noble
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