This course addresses specific aspects of cybersecurity related to aircraft avionic systems, going beyond traditional information technology systems. The course presents a five step vulnerability assessment and mitigation process, in which students learn how to discover, analyze, and consider mitigation of vulnerabilities in an avionic system. Significant topic areas including key cyber terms, factors related to cyber vulnerabilities and attacks, and how avionic systems are vulnerable to attacks. Real world examples of commercial exploitations are discussed to highlight system susceptibilities. In addition, the course will describe the principles of cyber hardening and resiliency and their relationship to protecting avionics systems. The course presents different hardening and resiliency approaches, and which approaches are appropriate given adversary attack methodologies, challenges, processes, and available access paths.