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IATF requirements assume that customer-authorized waiver must be documented in order to retain the evidence. We could see that per example at requirements 8.2.3.1.1 and 8.3.6.1.
Based on available facts at your question if you get documented waiver approval from the customer for Cpk monitoring above 1.33 that no issues with the IATF1694 clause 9.1.1.1.
Even that, you should to take in consideration that if during the monitoring process capability we have special causes that must be identified, analyze root causes and implement corrective actions to avoid reoccurrence., and according IATF16949 requirement 9.1.3.1 trends in operational performance shall be compared with progress toward objectives and lead to action to support prioritization of actions for improving customer satisfaction