A&D Technology designs and produces hardware systems with software integration for data acquisition and control applications. Every system manufactured at A&D undergoes a manufacturing validation process known as a Checkout. To maintain a competitive advantage in industry, A&D conducts continuous improvement projects, following their ISO mindset at a cultural level. This paper will discuss an ongoing Lean Six Sigma project in which the A&D manufacturing validation process is being improved, following the DMAIC framework with a heavy focus on the Plan-Do-Check-Act cycle. Data from the past two years of projects will be analyzed and new tools and standards will be created to improve the validation process of supplier hardware that has been installed in A&D manufactured systems.