Wybrane aspekty modelowania stanów awaryjnych statków powietrznych.

The paper presents a problem of accurrences of aircraft inefficiencies as a probabilistic phenomenon. An example of ambiguity of terminology applied to analysis of inefficiencies in the world's aviation has been given. A suggestion of some new approach to the phenomenon of inefficiencies has been made as well. A new definition od a failure state has been suggested. Two methods of analysing failure states of aircraft have been discussed. The first one is applicable to an object in operation, hence its name - Method of Object in Operation. The second one is applicable to an object under design, hence its name - Method of Object Under Design.