Since, according to a number of geometric and technical parameters, CAPM designs do not fully comply with the requirements of modern standards for capital bridges, their application is mainly oriented as temporary. In the process of withdrawing the CAPM sets stored in storage to the civilian construction sector, a significant demand for these structures was found to be due to their following advantages: complete staffing with all elements of the bridge, including supports the possibility of overlapping spans of 18.6, 25.6, 32.6 m with the dimensions of the driving bed 4.2 m for single-track and 7.2 m for double-track passage Passport carrying capacity is designated as 40 tons for single-track passage and 60 tons for double-track passage. Among others, including modern collapsible bridge designs, the middle automobile collapsible bridge (CAPM), developed in 1968 and modernized in 1982 for the needs of the USSR Ministry of Defense, occupies a special place. Inventory sets of collapsible bridges were designed and manufactured primarily in the interests of the military department, but are currently widely in demand and are used in the civilian sector of bridge building because of their economy, mobility, and accessibility in transportation. For this purpose, reusable mobile prefabricated structures are advisable. Temporary bridges are necessary to ensure movement during the construction or repair (reconstruction) of capital bridge structures, operational communication of interrupted tracks in various emergency situations, for one-time or seasonal transport communications. The findings indicate the presence of a clear relationship between a wide range of parameters that determine the indicators of economic feasibility of modernizing transport aircraft, as well as significant economic advantages of a high-quality modification of the aircraft design.
The leading approach in this study is a combination of analytical research of the issues of transport aircraft modification with empirical research of the economic feasibility of such measures, in the context of creating a coherent concept of the need for a set of measures to improve the structure of air transport. The purpose of this study is to establish a coherent model of the economic feasibility of aircraft modifications, which allows effectively solving the issues of cost savings in their design and subsequent launch into mass production and operation. The relevance of the subject matter is conditioned by the need to fully justify the implementation of modifications to the structures of transport aircraft from an economic standpoint, in order to save money during their construction and improve the functioning of the system for planning further design developments in this line.
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