During the operational process the activity is realized through ordered sequuence of certain actions united by unified motive. Actions can be simple and complex. Simple actions cannot be spread out to the elements having independent objectives. Complex actions can be presented in the form of set of simple actions. If the logical organization of this set is opened, complex action can be described as an algorithm consisting of simple actions. That means various kinds of operational activities develop from the same simple and typical actions, but in various sequence. The mistake of person's activity is always generating from more elementary performed mistake of an action. From here follows that mistakes of action are that primary parameter universal for any kind of activity of the aviation experts which can serve as a measure of an estimation of negative influence of human factor (HF). Aviation personnel comprise groups of experts from various profiles with different functional specialization and working in various services of civil aviation. It is obvious, that their influence on condition is also unequal and is defined by a degree of interaction with process of flight performance. The results of the analysis of air incidents on fault aviation of technical services are offered. The classification of the factors is considered is brave, connected with human factor, and as possible (probable) failures of various functional systems air transport to fault of technicians.