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9/8/98 AC 43.13-1B 90 percent blade radius point, the blade width and thickness may be modified as per the manufacturer’s instructions. b. Shortening Blades. Shortening pro- peller blades is a major repair. When the re- moval or treatment of defects on the tip neces- sitates shortening a blade, shorten each blade used with it and keep such sets of blades to- gether. (See figure 8-26 for acceptable meth- ods.) Mark the shortened blades to correspond with the manufacturer’s system of model des- ignation to indicate propeller diameter. In making the repair, it is not permissible to re- duce the propeller diameter below the mini- mum diameter limit shown on the pertinent specification or type certificate data sheet. c. Straighten Propeller Blades. Never straighten a damaged propeller. Even partial straightening of blades to permit shipment to a certificated propeller repair facility may result in hidden damage not being detected and an unairworthy propeller being returned to serv- ice. 8-74. REPAIR LIMITS. The following limits are those listed in the blade manufac- turing specification for aluminum-alloy blades and govern the width and thickness of new blades. These limits are to be used with the pertinent blade drawing to determine the minimum original blade dimensions to which the reduction of figure 8-27 and figure 8-28. may be applied. When repairs reduce the width or thickness of the blade below these limits, reject the blade. The face alignment or track of the propeller should fall within the limits recommended by the manufacturer for new propellers FIGURE 8-26. Method of repairing damaged tip of aluminum-alloy propellers. Par 8-73 Page 8-31PDF Image | AFS-640
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