Accreditations O'Fallon Casting is fully accredited to produce aerospace and defense quality castings. Our quality management system is ISO9001 and AS9100 accredited, and our Heat Treat, Non-Destructive Testing and Welding processes are NADCAP certified. Downloadable Certificates NADCAP - NonDestructive Testing NADCAP - Welding ISO 9001 / AS 9100 NADCAP - Heat Treating