This report presents the motivation, background, methods, and results of a Phase II SBIR project that continued the development of Process Compensated Resonance Testing (PCRT) as an alternative nondestructive inspection (NDI) method for in-service wheels and bolts for Air Force aircraft. The activities included significantly expanded data collection of hundreds of acceptable and dozens of defective wheels and bolts across multiple organizations and locations to build training libraries and configure PCRT inspections (Sorting Modules). PCRT Sorting Modules were found to be sensitive to structural damage and defects found in wheels and bolts such as cracks, over temperature exposure, and gouges. Phase II included the development of a prototype proof-of-concept wheel production system deployed at a civilian maintenance, repair and overhaul (MRO) wheel and brake shop. The production system was shown to handle high wheel system throughput in an operational environment and validate PCRT Sorting Modules by giving accurate PCRT classifications on parts that were not in the training libraries.

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