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This work is about the possibility of early diagnostics of the technical condition of the VR 294 main reduction gear in the MI 28N helicopter and its modified versions. Tribological tests of LZ 240 oil sam ples taken when testing the operational life are conducted based on the analytical ferrography, morphological analysis, wear particle count, and spectroscopic analysis.

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In this paper, three ways to prevent increased wear of parts of the drive box and the central drive of a civil aviation gas turbine engine, based on tribology, using methods such as ferrography, filterography and computer analysis of the classification and calculation of wear particles were considered. Investigations of the results obtained by these methods revealed the circumstances that would allow in advance to prevent the occurrence of an emergency and, therefore, can form the basis of the methodology. This technique, based on the analysis of the parameters of wear particles in oil, belongs to the group of methods for non-destructive testing of the technical condition of machines and mechanisms.