TÜV factory certification annual audits (surveillance audits) are typically conducted once a year to ensure that the factory's quality management system and production consistency continue to meet relevant standards. Only after passing the audit can the company continue to legally use the TÜV mark. Key points and preparation checklist for the annual audit: System document review: Check the quality manual, procedural documents, organizational structure, and internal audit management review records. Document consistency: Verify production drawings, BOM, and process documents to ensure consistency with the original TÜV certification parameters. Key component verification: Confirm that the brands and models of currently used key materials are consistent with those required in the certificate/report. Instrument calibration: Verify all measuring instruments used in production and testing (especially safety testing instruments) to ensure they are within their validity period. Production and testing records: Randomly check product identification, first article inspection, in-process inspection, and finished product factory test records on the production line. Product consistency check: Randomly sample finished products on-site and compare them with the TÜV type test report to confirm that there have been no unauthorized changes to the structure, materials, and key parameters.
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