How does Design for Manufacturing (DFM) influence aircraft design?

DFM ensures designs are producible at target cost and quality. Principles: Part count reduction - Fewer parts means less assembly labor, fasteners, and potential failure points; Accessibility - Space for tools and hands during assembly, inspection access; Standardization - Common fasteners, materials, processes; Tolerances - Realistic tolerances achievable by planned processes; and Automation compatibility - Designs suitable for automated drilling, fastening, layup. Manufacturing methods influence design: Sheet metal - Bend radii, material utilization; Machining - Tool access, fixturing; Composites - Drape forming limits, cure tooling; and Assembly - Join sequences, shimming requirements. Concurrent engineering: Manufacturing engineers involved from conceptual design, Producibility reviews at each design phase. Metrics: Touch labor hours per unit, Assembly time, and Part cost vs. manufacturing method. Learning curve: First units expensive, cost decreases with production quantity. Design changes after production start are extremely costly.