The "Aviation Source Approval and Management Handbook" outlines procedures and policies for approving sources supplying aviation-critical safety items (CSIs) within the U.S. military and defense agencies. It emphasizes compliance with the Competition in Contracting Act and other relevant regulations to ensure open competition and source quality. The handbook details types of approved sources like original equipment manufacturers (OEMs) and qualified suppliers, along with processes for Source Approval Requests (SARs), including risk management and technical review protocols. Key chapters cover the responsibilities of procuring activities, the SAR process, and the importance of validating sources through robust review processes, such as evaluating past performance and adherence to quality assurance standards. It also addresses the management of critical and non-critical items, reverse engineering, parts manufacturer approvals, and local purchase protocols for CSIs. Overall, the handbook serves as a vital guide for ensuring the procurement of high-quality and conforming aviation parts, thus supporting the military's operational readiness and safety standards. It provides a comprehensive framework to encourage efficient and competitive sourcing while maintaining stringent quality controls in the procurement process.