Scrap in aerospace manufacturing is not just a local efficiency issue; it can undermine program-level margins, schedules, and cash flow. Because parts are expensive, lead times are long, and contracts carry strict delivery and quality terms, recurring scrap can trigger margin erosion, liquidated damages, requalification costs, and reputational risk across an entire program.

In aerospace, MES cost metrics only matter if they are tied to validated data, traceable events, and existing ERP/PLM/QMS realities. Executives should track total manufacturing cost per unit, conversion and rework costs, schedule-driven penalties, NFF and yield losses, and cost of poor quality, while recognizing that data completeness, integration quality, and long asset lifecycles limit precision.