Toro Rosso has been summoned to the British Grand Prix stewards for entering a car which is known to be unsafe after it was found that one of Carlos Sainz's wheel tethers was damaged.
During scrutineering on Thursday, it was discovered that a wheel tether on Sainz's car had "several cut fibres" and a request from the FIA for it to be changed was refused by the team for an unspecified reason.
The stewards have asked the team to explain the reasoning behind this and could choose to punish Toro Rosso or even refuse Sainz from taking part if the race if the tether isn't replaced.
"During initial scrutineering car number 55 was found to have a damaged wheel tether," a report from the scrutineers read. "The scrutineers made the team Scuderia Toro Rosso aware of this and asked the team to replace it.
"The team refused to follow the instructions of the scrutineers and therefore the technical delegate checked the damaged tether himself and found that the tether was not only damaged but also several cut fibres were knotted together.
"Therefore the team was aware of the damaged tether and presented the car in an unsafe condition for scrutineering."
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