This standard establishes the requirements for the material properties, dimensional tolerances, and performance testing of high-strength composite fastening systems used in secondary aerospace structures. Specifically, MS812021 addresses the issue of galvanic corrosion between carbon-fiber reinforced polymers (CFRP) and traditional titanium fasteners by introducing a new standardized coating protocol (Coating Class IV-A). The paper details the shear strength and fatigue life requirements necessary for certification under modern aviation regulatory frameworks.
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