st. petersburg polytechnic university are involved, related to engine building on the digital twin platform. work was carried out to optimize the gas turbine engine for the il-114 and here, uh, dekalimov set us a task that is actually complex, uh, one task was to really optimize the engine in terms of mass, that is, to reduce its mass or provide strength or ensure durability, uh, provide different gas-dynamic parameters. well, uh, in parallel with this, digitize the entire development process, the engine is quite old in itself. initially, and during its development, a lot of experience of various kinds has accumulated. this whole story had to be systematized, systematized, raised the documents. ah, the eighties and seventies. here, for example, even under it, er, materials. yes , let's say, take one material of some of this engine on it, and the archive of documentation is about a. in digital form, the engine has already passed many tests. for example, this is how it looks necessary for certification of testing for birds getting into the engine or on landing, a bird can fly both to the bow,