Airbus helicopters must now check for tail rotor failures, or be grounded

US aviation regulators are proposing new rules for certain Airbus helicopters. These rules would require operators to inspect the tail rotor driveshaft for damage and replace parts if needed.

This is a safety mandate. It means that operators of these specific Airbus helicopter models must now perform a new inspection. If they find problems, they must fix them or the helicopter cannot fly.