Book excerpt: Transport aircraft systems have undergone many changes in the rapidly advancing electronic age, and Transport Category Aircraft Systems helps make sense of them. Designed for readers who know some aeronautical terminology and basic aircraft systems, this book provides in-depth explanations and detailed illustrations of large, transport-category aircraft and their onboard systems. It introduces aircraft systems by explaining the basics that are common to all large aircraft. By understanding how a system works on a specific aircraft, the reader can generalize that understanding to other aircraft. Transport Category Aircraft Systems covers everything from electrical power systems to oxygen systems to communications systems and beyond.