Summary
We propose to adopt a new airworthiness directive (AD) for certain Airbus Model A318, A319, A320, and A321 series airplanes. This proposed AD was prompted by a report of a crack found in the fuselage during a fatigue test campaign. This proposed AD would require repetitive rototest inspections for cracking; corrective actions if necessary; and modification of the torsion box, which would terminate the repetitive inspections. We are proposing this AD to prevent cracking in the side box beam flange of the fuselage, which could affect the structural integrity of the airplane.