Modernization of the fan housing of D-18T engine in the 3M profile

In the course of upgrading the D-18T Series 3 engine fan casing to the 3M series, documentation was developed and a ring was made of the 6NT polymer composite organite material by the winding method, which was used to increase the impenetrability margin when the fan blade breaks. This ring is necessary for upgrading the existing protective ring, which excludes the need to manufacture a new one, thus reducing the labor input by ≈60% as well as the use of expensive materials.