This paper describes the major rules and processes developed to maintain the airworthiness of the aging fleet. Based on the life extension program for the Airbus A300/A300-600 aircraft, the major fuselage activities of the manufacturers are explained to comply with the newest regulations. This includes methodologies to analyze structures susceptible to local damage, multiple local damage and multiple site/multiple element damage for the original structure and structural repairs. The capability of NDI (nondestructive inspections) techniques is reviewed to define the current status and the industrial needs, especially for structural areas potentially susceptible to widespread fatigue damage (WFD). Guidelines for application of PoD (probability of detection) curves to determine inspection requirements for WFD areas are also presented. Finally the statistical evaluation of in-service results is discussed to define appropriate maintenance actions.
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