A947-1 FLEXPLATE FRACTURE FORWARD FLEXIBLE
2010-11-24 · Analysis of the flexible coupling failure established that fatigue cracking in the flexplate arm at the bolted joint between the flexplate and main rotor gearbox yoke resulted from a lack of clamping force between the members of the bolted joint – flexplate, bolt, nut, washers, and yoke. The lack of clamping force resulted in
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