The FIA's Nikolas Tombazis says Red Bull's ride height control controversy is not history.

FIA single-seater boss Nikolas Tombazis said the controversy surrounding Red Bull's car at this weekend's US Grand Prix will no longer be a story after the governing body intervened.

Ahead of this weekend's race at Circuit of the Americas, Red Bull confirmed that there is a device under the pedals of its car that can effectively change the front ride height.

No other team is believed to have such a device and it has led to speculation that it could be used to secretly change the ride height between qualifying and the race when the car is in parc ferme conditions .

Setup changes in parc ferme are strictly limited to the front wing angle and tire pressure. FIA technical commissioners and video surveillance ensure that the teams do not make any changes.

Tombazis said there was no evidence Red Bull had done anything illegal and believes introducing a seal covering the device means any attempt to do so in the future will be easily detected.

“At the previous race we were advised that certain designs could allow a change in the height of the front of the car, which some call the starting number, in parc ferme,” Tombazis told Sky Sports.

“We had no indication or evidence that anyone was doing such a thing, it would clearly be illegal under parc ferme regulations.”

“But as I said, we had no clear indication that anyone was doing something like that, so we said from this race onwards there should be no possibility of doing something like that at all.”

“So if a team has a design that allows for that height to be changed quickly, then it had to be sealed so they wouldn't have access in the parc ferme. I think all the teams have complied with it, and as far as we're concerned, it's somewhat under control.

Asked if the controversy is no longer a story now, he added: “I think it is no longer a story from now on. I think we've done everything necessary to prevent there being any accusations, and then of course it's a difficult championship, and people are pretty happy about each other's cars.

“Therefore we cannot finalize the previous races or any hints between the teams in a very competitive environment, but in the current situation we believe it is not a story, yes.”

Red Bull team boss Christian Horner downplayed the importance of the device, saying other setup changes were actually easier to carry out in parc ferme conditions.

“Every car has a tool that allows them to adjust the front of the bib. We call the front of the floor the bib,” Horner said. “Ours is at the front, in front of the footwell. I think it’s been there for over three years.”

“You have to remove the pedals, other panels and plumbing to get there. It’s like any other adjustment on the car.”

“It would be easier to adjust a rear roll bar than to access this component. It’s all part of the packaging in the front end of the chassis.”

After McLaren CEO Zak Brown raised the issue during a press conference earlier in the day, Horner said Red Bull's rivals had provided the catalyst for the FIA's action.

“I think one of our rivals groaned a bit,” Horner added. “And it is the FIA’s job to investigate these things.

“It's on a list of open source components; it has been publicly available for three years.

“The FIA ​​​​is satisfied with it. I think just to maybe satisfy a bit of paranoia elsewhere in the paddock.”