The article compared the results of high cycle fatigue tests in samples of aluminum alloy 2024-T4, which is used in aircraft construction, especially for highly loaded structural elements, including for plating and fuselage frames and girders rotor blades of helicopters - with results available in the literature. The tests were performed on cylindrical samples, of a parallel and perpendicular orientation relative to the "direction of embodiment" or the rolling direction of the blank sheet metal with a coefficient of asymmetry cycle R = −1. Material for the study was collected from the production line design elements PZL-130 Orlik TC-II. There have been a description of the analytical results in the form of Morrow equations. The results were referred to the respective curves contained in a database of material U.S. Department of Transportation Federal Aviation Administration. There have been a presentation the transformation method of S-N curves for different stress ratio R, stress concentration factors Kt and safety factors βN and βσ.