Airworthiness Directives; Airbus Industrie Model A300-600 Series Airplanes

This amendment supersedes an existing airworthiness directive (AD), applicable to all Airbus Industrie Model A300-600 series airplanes, that currently requires inspections to detect cracks in the center spar sealing angles adjacent to the pylon rear attachment and in the adjacent butt strap and skin panel, and correction of discrepancies. This amendment requires that the initial inspections be accomplished at reduced thresholds. This action also limits the applicability of the existing AD. This amendment is prompted by reports of cracking in the vertical web of the center spar sealing angles of the wing. The actions specified by this AD are intended to prevent crack formation in the sealing angles; such cracks could rupture and lead to subsequent crack formation in the bottom skin of the wing, and resultant reduced structural integrity of the center spar section of the wing.