The Friday pace-setter Hamilton, is the favourite to qualify top of the timesheets come Saturday afternoon, he faces a five-place grid penalty.
A Mercedes team spokesman reveals that the gearbox trouble resulted from the previous race in Azerbaijan. The F1 technical delegate said in a declaration that Mercedes had informed him about the change last Tuesday.
44 – Mercedes – Lewis Hamilton
“The above driver did finish the last race in Baku and this gearbox change was before the six consecutive Events expired,” read the FIA document compiled by technical delegate Jo Bauer.
“As this is not in compliance with Article 23.5a of the 2017 Formula One Sporting Regulations, I am referring this matter to the stewards for their consideration.
“The team informed the technical delegate about the gearbox change on Tuesday 4th July 2017, at 11:29 hours.”
Earlier on Friday, the Brit was all smiles as he spoke of his happiness with the setup of his car and his impressive pace in the practice sessions.
“The car feels fantastically fast here. There’s already a nice balance and it feels good out on track,” he said.
“The team is in good spirits and we’re all up for another exciting fight with the Ferraris this weekend.”
Hamilton is 14 points behind championship leader Sebastian Vettel in the standings following eight of 20 races. Both have won three races each.