IntroductionFollowing the recent developments in renewable energy sources, wind turbines have been one of the major devices on which emphasis has been placed. Basically, wind turbines are devices that convert the kinetic energy of wind into electrical energy for human use. “Wind farms” are created in very windy places to harness this energy. However, it is impossible to exploit the full energy potential of the wind. Only 59% of the total kinetic energy of the wind flowing through the turbine can be harnessed. Efficiency depends greatly on the maintenance of the wind turbine and its components. A variety of tests can be applied to test materials and structures. Extensive analysis and NDT testing carried out. The life cycle of wind turbines, the blades are a very important component. . Equipment life due to spinning and exposure to the environment causes thermal stress, corrosion, oxidation and erosion. These aspects reduce the lifespan of the wind turbine. Lifespan may vary with use, due to many unforeseen incidents occurring in the blade environment. In addition, certain types in production or repair can deteriorate the components and at the same time reduce the lifespan of the modules. DRY TESTING The bleed test is the NDT method most often used to inspect wind turbine blades and blades. It is recommended to use fluorescent penetrants for examination. After some time of overhaul, the surface of the blade is often corroded. Under these circumstances, fluorescent penetrant testing is not recommended and normal penetrant testing is more practical. The disadvantage of penetrant testing is that it is only suitable for cracks opening on the surface. Underground faults cannot be detected. As soon as a crack is noted, it is not possible to estimate its d...... middle of paper systems ......ted. In addition to indicating the depth of defects, ET is also likely to provide better sensitivity and therefore earlier indications for life assessment of uncoated components than inspections based solely on surface techniques . Sensor limitations have delayed parallel UT developments, but the obstacles do not appear insurmountable. CONCLUSION There are many methods available to determine the properties of turbine blades. Some of these methods can be used to supplement the information from penetrant testing. Most methods are available only at the laboratory stage. But there are some techniques, such as eddy current and ultrasonic techniques, that can be used in practical on-site inspections. The driving force behind the NDT assessment is of course the need for utilities to optimize plant operation and minimize the risk of in-service damage...