1. Hang members onto the display area, check whether the members correction ( next to bend / twisted / camber, and so on ) is qualified. After confirmation of qualification, underline the center line and milling lines of every surface, and type the punch marks.

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Self tests : At the time of correction, self tests should be made at any time. Test the flatness of the wing plates and webs; flip 180 degrees to redress the other wing plate after the correction has been qualified.Test the flatness of the wing plates, webs and section diagonals after completing the above step.