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AC 43.13-1B 9/8/98 FIGURE 1-10. Method of reinforcing a longitudinal crack and/or local damage in a solid spar. for determining which process of bending should be used for the curvature being consid- ered. a. Plywood, after softening, may be bent on a cold ventilated form, or it may be bent over the leading edge near the area being patched if space permits. In either method the repair part should be allowed to dry completely on the form. When bending plywood over a leading edge, drying may be hastened by lay- ing a piece of coarse burlap over the leading edge before using it as a bending form. To speed drying, a fan may be used to circulate air around the repair part. b. In bending pieces of small radii or to speed up the bending of a large number of parts of the same curvature, it may be neces- sary to use a heated bending form. The surface temperature of this form may be as high as 149 °C (300 �F), if necessary, without danger of damage to the plywood. The plywood should be left on the heated form only long enough to dry to room conditions. 1-50. REPAIRS TO DOUBLE CURVA- TURE PLYWOOD SKIN. The molded ply- wood necessary for a repair to a damaged ply- wood skin of double curvature cannot be made from flat plywood unless the area to be re- paired is very small or is of exceedingly slight double curvature; therefore, molded plywood of the proper curvature must be on hand before the repair can be made. If molded plywood of the proper curvature is available, the repair may be made using the same procedure as on single curvature skins. Page 1-22 Par 1-49PDF Image | AFS-640
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