Statistical Process Control Audits for Dual-Sourced Component Verification
Dynamic volume re-allocation tied to audited Cpk capability metrics aligns dual-supplier process means, mitigating bimodal assembly defect risks.
Control Chart Auditing
Meaning
Oversight verification process involves the systematic review of statistical logs to ensure that production remains within defined limits. Control chart auditing confirms that the factory staff are recording data accurately and responding to any signals of instability. This practice prevents the falsification of quality records during long production cycles.
Record Integrity
Inspectors examine the timestamps and handwriting on the physical charts to identify patterns that suggest fabricated data. If every entry on a control chart auditing log looks identical, it likely indicates that the measurements were not actually taken at the scheduled intervals. Authentic records show the natural variation expected in a mechanical process.
Inspector Authority
Third party auditors have the right to demand these documents at any time during a site visit under the terms of a standard supply contract. During control chart auditing, the auditor may re-measure a current batch of parts to see if the findings match the internal log, and they can interview the operator to verify their understanding of the charting rules. Discrepancies found here can lead to a failed audit and a requirement for a formal corrective action plan to be submitted to the buyer within ten working days.
Procedural Compliance
Standard operating instructions specify how often a worker must sample the line and what actions follow an out of control point. Effective control chart auditing ensures that these rules are followed every day rather than just when a customer is present. This discipline maintains the reliability of the quality management system over time.