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There's no way you could spot a fractured spar (or similar) on a walkround
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This actually a lot easier on a fabric covered aeroplane than on a metal one - another very good reason for flying a Robin. During the walkround, drum your fingers on the fabric between each pair of adjacent ribs and listen. Even if the skin isn't wrinkled, any lack of tautness will be audible as a much duller sound. You should certainly be able to spot a damaged rib by this method.