There is a simple check that you can do to make sure a drawing of a wing (or other 'mirrored component') is the same on both sides. Fold the plan in half along the centre line of the wing then hold the drawing against a window, instant 'light box'. The daylight will shine through the drawings enabling you to see a superimposed image of the 2 wing panels. Aline the 2 wing panel drawings then move the top drawing slightly from left to right or up and down and you will soon see if there are any anomalies. If you do discover any discrepancies the amendments can be carried out at this stage instead of carrying them out after the construction has been undertaken.
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