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The previously unknown defects were discovered only after magnetic particle inspection procedures adheringto ASTM standard practices were rigorously followed. Subsequent investigation and analysis of the indications revealedno growth of the laps in service. Nevertheless, the corrective action defined that all forgings showing laps be removedfrom service. Preventive measures involved critical review and revision of the forging process (so that future lots wouldbe properly forged) and revisions to the nondestructive evaluation (NDE) procedures at the forging supplier.
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