Summary
We propose to adopt a new airworthiness directive (AD) for certain Airbus Model A318 series airplanes; Model A319 series airplanes; and Model A320-211, -212, -214, -216, -231, -232, and -233 airplanes. This proposed AD was prompted by a report indicating that the lower rib foot angle of the center wing box did not match with the bottom skin panel inner surface. This proposed AD would require repetitive inspections for cracking of the external bottom skin in certain areas on the left and right wings, and corrective actions if necessary. This proposed AD also provides an optional terminating modification for the repetitive inspections. We are proposing this AD to address the unsafe condition on these products.