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AC 43.13-1B 9/8/98 FIGURE 3-21. Stop-drilling cracks. a. Surface Patch. If a surface patch is to be installed, trim away the damaged area and round all corners. Cut a piece of plastic of suf ficient size to cover the damaged area and ex tend at least 3/4 inch on each side of the crack or hole. Bevel the edges as shown in fig ure3-22. If the section to be repaired is curved, shape the patch to the same contour by heating it in an oil bath at a temperature of 248to302°F, or it may be heated on a hot-plate until soft. Boiling water should not be used for heating. Coat the patch evenly with plastic solvent adhesive and immediately place it over the hole. Maintain a uniform pressure of 5 to 10 psi on the patch for a minimum of 3 hours. Allow the patch to dry 24 to 36 hours before sanding or polishing. b. Plug Patch. When using inserted patches to repair holes in plastic structures, trim the holes to a perfect circle or oval and bevel the edges slightly. Make the patch slightly thicker than the material being FIGURE 3-22. Surface patches. Page 3-20 Par 3-24PDF Image | AFS-640
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