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9/27/01 AC 43.13-1B CHG 1 SECTION 4. REPAIR OF METAL PROPELLERS 8-71. GENERAL. Reject damaged blades with model numbers which are on the manu- facturer’s list of blades that cannot be repaired. Follow the propeller manufacturer’s recom- mendations in all cases, and make repairs in accordance with latest techniques and best in- dustry practices. NOTE: Title 14 of the Code of Fed- eral Regulations, 14 CFR, part 65 does not allow an airframe and power plant mechanic to perform major re- pairs to propellers. 8-72. STEEL BLADES. Due to the critical effects of surface injuries and their repair on the fatigue life of steel blades, all repairs must be made in accordance with the manufacturer’s instructions. 8-73. ALUMINUM PROPELLER RE- PAIRS. Aluminum-alloy propellers and blades with dents, cuts, scars, scratches, nicks, leading-edge pitting, etc., may be repaired, provided the removal or treatment does not materially affect the strength, weight, or per- formance of the blade. Remove these damages or otherwise treat as explained below, unless it is contrary to the manufacturer’s instructions or recommendations. More than one injury is not sufficient cause alone for rejection of a blade. A reasonable number of repairs per blade may be made and not necessarily result in a dangerous condition, unless their location with respect to each other is such to form a continuous line of repairs that would materi- ally weaken the blade. Suitable sandpaper or fine-cut files may be used for removing the necessary amount of metal. In each case, the area involved will be smoothly finished with #00 sandpaper or crocus cloth, and each blade from which any appreciable amount of metal has been removed will be properly balanced before it is used. Etch all repairs. To avoid removal of an excessive amount of metal, local etching should be accomplished at intervals during the process of removing suspected scratches. Upon completion of the repair, carefully inspect the entire blade by etching or anodizing. Remove all effects of the etching process with fine emery paper. Blades identi- fied by the manufacturer as being cold-worked (shot-blasted or cold-rolled) may require peening after repair. Accomplish repair and peening operations on this type of blade in ac- cordance with the manufacturer’s instructions. However, it is not permissible in any case to peen down the edges of any injury wherein the operation will lap metal over the injury. a. Flaws in Edges. Round out nicks, scars, cuts, etc., occurring on the leading edge of aluminum-alloy blades as shown in fig- ure 8-24 (view B). Blades that have the lead- ing edges pitted from normal wear in service may be reworked by removing sufficient mate- rial to eliminate the pitting. In this case, re- move the metal by starting a sufficient distance from the edge, as shown in figure 8-25, and working forward over the edge in such a way that the contour will remain substantially the same, avoiding abrupt changes in contour. Trailing edges of blades may be treated in sub- stantially the same manner. On the thrust and camber face of blades, remove the metal around any dents, cuts, scars, scratches, nicks, and pits to form shallow saucer-shaped depres- sions as shown in figure 8-24 (view C). Exer- cise care to remove the deepest point of the injury and also remove any raised metal around the edges of the injury as shown in fig- ure 8-24 (view A). When repairing blades, figures 8-26 and 8-27 show the maximum re- duction in width and thickness that is allow- able below the minimum dimensions required by the blade drawing and blade manufacturing specification. Beyond the 90 Par 8-71 Page 8-29PDF Image | AFS-640
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