The "Aviation Source Approval and Management Handbook" outlines the policies and procedures for approving sources that provide Critical Safety Items (CSIs) in aviation. It emphasizes promoting full and open competition in accordance with federal acquisition laws. Key responsibilities for procuring activities include ensuring compliance with source approval requirements, reviewing quality performance histories, and maintaining contracts with approved sources. The handbook details the Source Approval Request (SAR) process, specifying how prospective suppliers can demonstrate their capabilities to meet technical and quality standards. It defines several types of approved sources, including prime contractors, original equipment manufacturers (OEMs), and qualified suppliers through a clear framework of responsibilities and risk management. Special attention is given to reverse engineering, where a structured process is applied to replicate items responsibly. Additionally, it shares insights into local purchases, service depot manufacturing, and surplus material considerations while stressing quality control and validation mechanisms to ensure compliance with safety and technical specifications. The handbook is integral to government RFPs, federal grants, and state/local procurement processes, establishing procedural standards for maintaining airworthiness and safety in military aviation operations.