The focus of this diploma thesis is on human as increasing factor in source of aviation events and effect of digital avionic systems on safety. Theoretical part discusses human factor and in detail describes human factor analysis HFACS and HRA. Further are discussed pros and cons of rise of digital instruments. Second part of thesis is focused on analysis of aviation events in Czech republic in category general aviation of maximum takeoff weight 2250kg in years 2004-2014 and analysis of accidents comparing aeroplanes with analog and digital instruments. Thesis also includes short analysis of video record using both types of instruments with focus on distribution of attention.