Avionics is the collective name for all aircraft avionics systems. The textbook is intended for students, cadets and graduate students of technical universities, flight schools and academies studying avionics systems. The book contains a systematic review of the current state and prospects for the development of both individual avionics systems and its architecture as a whole. The main classes of systems are considered: navigation, overview, communication, automatic control, information display, maintenance, etc. Functions, operating principle, internal structure, technical characteristics and features are described.