Airplane mechanics must now use a torque wrench on rudder parts, and seal it

The US aviation regulator proposes a new rule for certain Airbus Canada airplanes. Mechanics must properly tighten and seal specific hydraulic fittings on the rudder control units.

This rule comes after a hydraulic fluid leak was traced back to an uncalibrated torque wrench. It means that a specific, common maintenance step will now be formally mandated and checked, reducing the chance of similar failures. It shifts the responsibility for this specific maintenance detail from general best practice to a binding regulatory requirement.