Ah, the“Three Fs”—form, fit and function. They’ve driven the design and fabrication of aftermarket parts since their inception. So good have manufacturers become at adhering to those principles that PMA parts are now manifestly mainstream, no longer relegated to the black sheep status they once occupied. With that perceptual hurdle surmounted, can aftermarket parts be rendered not merely as good as their OEM counterparts, but better? The short answer: sometimes. Design Determinants ...

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