Tail Rotor Driveshaft Hanger

BHT-212-CR&OA Acceptable pattern typical of low operatingtime.B Acceptable pattern typical of couplings whichhave operated with normal misalignment for alonger period of time than that shown in A.W//\\4C Acceptable pattern denoting operation athigher torque than that shown in A and B.+O+ +O+D Acceptable pattern showing a pitted tooth.This condition is acceptable on all teeth.=mmEPattern shows a more severe condition oftooth pitting than that shown in D. There isno metal projecting above the normal face ofthe tooth, indicating that the pitted area ispolishing over. This condition may exist on allteeth. Couplings with pits larger than 1/32Inch (0.79375 mm) diameter should be replaced.00000oooo65 3Figure 65-3.Tail rotor driveshaft coupling wear pattern65-00-00Page 14