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Civil aircraft is the most complicated production of the world and during the manufacture various kinds of manufacture nonconformities occur at times. Superfluous hole is one of the most typical nonconformity types. When coping with this kind of problem, engineers often lack experience or standard treatment criteria, which may cause verbose treatment progress, low production efficiency or even technique risk. This article firstly introduces reasons for different types of superfluous holes and figures out treatment procedure and methods and analyses strength evaluation and assessment method.

Civil Aircraft metal structure superfluous hole repair and stress evaluation method