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AC 43.13-1B 9/8/98 a. No repairs are permitted to the shanks (roots or hub ends) of aluminum-alloy, adjust- able-pitch blades. The shanks must be within manufacturer’s limits. b. The following two examples show how to determine the allowable repair limits on aluminum alloy blades. (1) Example 1. Determine the blade width repair allowable (∆w) and minimum blade width limit, (w1) for a blade having a di- ameter (d) of 10 ft. 6 in. The repair location (r1) is 24 in. from the shank and the original, as manufactured, blade width (w) at the repair location is 1.88 in. (a) Step 1. Calculate the blade radius r = d/2 = (10 ft 6 in)/2 = 126/2 = 63 in. (b) Step 2. Calculate percent of blade radius to repair (r%) r% = r1/r x 100 = (24/63) x 100 = 38 (r) a. Draw a vertical line at the value of r% = 38 on the horizontal axis. b. Where the vertical line intersects the curve, draw a horizontal line to the right to intersect the vertical axis. c. Read the percent reduction in width (∆w%) on the vertical axis at this intersection. ∆w% = 2.5 FIGURE 8-27. Example 1. Determine the repair width limits. Page 8-32 Par 8-74PDF Image | AFS-640
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