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9/8/98 AC 43.13-1B TABLE 1-2. Minimum recommended bend radii for aircraft plywood. 10 PERCENT MOISTURE CONTENT, BENT ON COLD MANDRELS THOROUGHLY SOAKED IN HOT WATER AND BENT ON COLD MANDRELS PLYWOOD CHARACTERISTICS AT90�TO AT0�OR 45� FACE GRAIN TO FACE GRAIN AT 90� TO AT 0�0R 45° FACE GRAIN TO FACE GRAIN THICKNESS (INCHES) OF PLIES .035 3 .070 3 .100 3 .125 3 .155 3 .185 3 .160 5 .190 5 .225 5 .250 5 .315 5 .375 5 NUMBER MINIMUM BEND RADIUS (INCHES) 2.0 1.1 5.2 3.2 8.6 5.2 0.5 1.5 2.6 3.8 5.3 7.1 6 7 10 12 16 0.1 0.4 0.8 1.2 1.8 2.6 2 3 4 5 7 12 16 20 17 21 27 31 43 54 7.1 10 13 11 14 17 20 28 36 21 10 1-51. TYPES OF PATCHES. There are four types of patches: splayed patch, surface (or overlay) patch, scarf patch, and plug patch. They are all acceptable for repairing plywood skins. a. Splayed Patch. Small holes with their largest dimensions not over 15 times the skin thickness, in skins not more than 1/10 inch in thickness, may be repaired by using a circular splayed patch as illustrated in figure 1-13. The term “splayed” is used to denote that the edges of the patch are tapered, but the slope is steeper than is allowed in scarfing operations. (1) Lay out the patch according to fig- ure 1-13. Tack a small piece of plywood over the hole for a center point and draw two circles with a divider, the inner circle to be the size of the hole and the outer circle marking the limits taper. The difference between the radii Par 1-50 Page 1-25 of the is 5T (5 times the thickness of the skin). If one leg of the dividers has been sharpened to a chisel edge, the dividers may be used to cut the inner circle. (2) Taper the hole evenly to the outer mark with a chisel, knife, or rasp. (3) Prepare a circular tapered patch to fit the prepared hole, and bond the patch into place with face-grain direction matching that of the original surface. (4) Use waxed paper or plastic wrap, (cut larger than the size of the patch) between the patch and the plywood pressure plate. This prevents excess adhesive from bonding the pressure plate to the skin. Center the pressure plate carefully over the patch.PDF Image | AFS-640
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