An overview of traditional methods for cleaning the surface of gas turbine engine (GTE) blades from products of gas corrosion and spent coating, methods for restoring the structure and properties of the material of blades using hot isostatic pressing and heat treatment, as well as methods for applying coatings on the inner and outer surfaces of the blades is presented. The main disadvantages of these methods are described, taking into account which the state-of-the-art technology for repairing gas-turbine engine nozzle blades made of ZhS6U alloy has been developed in FSUE «VIAM», which ensures an increase in their resource and a reduction in repair costs.