By:  Cliff Lange and Matt Freeman

OEMs recommend periodic inspection of pinned finger turbine blade attachments for detection of service-induced damage as part of ongoing rotor maintenance activity. 

This article provides an example where ultrasonic inspection detected cracking in several pins of finger attachments and outlines an engineering assessment to support continued operation and identify a re-inspection interval.  This approach can be applied to other pinned finger blade attachments to determine suitability for service.

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