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NADCAP special processes are manufacturing operations that cannot be fully verified through subsequent inspection or testing because their results are not readily apparent until the product is in use. These processes require specific controls, qualified personnel, and validated procedures to ensure consistent, acceptable results.
Special processes covered by NADCAP accreditation include heat treating, welding, brazing, chemical processing (such as anodizing and plating), non-destructive testing, and specialized coatings. Each process has industry-developed audit criteria that define equipment requirements, personnel qualifications, process parameters, and quality control methods. Organizations must demonstrate process capability and maintain detailed records for each accredited process.
NADCAP special process audits assess whether suppliers have adequate controls to produce conforming products consistently. Auditors verify equipment calibration, operator training records, process monitoring systems, and compliance with applicable technical standards. Aerospace manufacturers rely on NADCAP accreditation to qualify suppliers for these critical operations without conducting separate special process audits.
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