Aviation transport as a complex system. Flight safety. Aviation accidents. Disadvantages. Aviation safety as an aviation system feature. System performance criteria for assessment of specific situations and their identification. Aircraft safety indicators and performance criteria. Aircraft technical condition analysis methods. Maintenance system psychological environment. Flight safety assurance active methods. Human factors. Aviation accidents. Onboard means of aviation technical condition and crew work objective control. Human factors basic principles in modern civil aviation. Action causing fatigue factors. Factors influencing the activity.