Description: It is rotined in the article, that for the increase of tactical and technical descriptions, including increase of technical resource, complex technical complexes which are in exploitation twenty and more than years, there are three ways: development and making of new complexes, modernization of existing and purchase of analogues of existent complexes. In the conditions of financial limitations to conduct complete replacement of inveterate (technically and, sometimes, morally) complexes there is not possibility, the method of leadthrough of feasability study of choice of way of increase of tactical and technical descriptions of inveterate complexes is therefore offered. Grounded factors, which influence on the leadthrough of development, modernization or purchase of complexes. The developed method allows to conduct the economic ground of way of proceeding in the resource of complex technical complexes depending on their assigning and present facilities for these aims in the conditions of financial limitations.
Keywords: complex technical complexes, feasability study, development, modernization