Evaluation of deterministic spectral gust methods

Standard methods for the calculation of Design Continuous Gust Loads cannot be applied in the case of aircraft with nonlinear response characteristics. In such cases, Design Loads can be calculated using stochastic simulation techniques. These techniques, however, require a very large computational effort. Hence, alternative methods, indicated as "Deterministic Spectral Gust Methods" have been developed. This report gives a brief review and comparison of three of these methods. A proposal is formulated for a Cooperative Working Activity, to evaluate and validate these methods as an "acceptable means" for the Definition of Design Continuous Gust Loads for nonlinear aircraft.