Red Bull drivers Daniel Ricciardo and Sebastian Vettel have both been excluded from qualifying at the Abu Dhabi Grand Prix.
Ricciardo and Vettel qualified in fifth and sixth places but were referred to the stewards after FIA technical delegate Jo Bauer discovered an irregularity.
"When checking the front wing of car numbers 01 and 03, it was found that the front wing flaps were designed to flex under aerodynamic load," read a statement.
The matter was referred to the stewards who deemed that neither car complied with Article 3.15 of the Technical Regulations, which limits moveable aerodynamics.
The stewards decided that both Ricciardo and Vettel would be excluded from the results of Saturday's qualifying session, but they are permitted to start the race from the back of the grid.
Red Bull accepted the stewards' ruling but nonetheless criticised the FIA for singling them out.
"Following the decision of the Stewards regarding the front wings on both our cars (Car 1 and Car 3), we are disappointed that we have been singled out for a front wing deflection test when it is clear that other teams are interpreting the rules in a similar fashion," they said.
"The team accepts the decision of the Stewards and will start the race from the back of the grid."