Using the mean flow presented in fig. 1 and fig. 2, NLDE is solved to predict the time-accurate perturbation quantities. Fig. 6 and fig. 7 gives a perturbation velocity intensity contour plot for the frigate with 0 degree yaw angle wind. At the incoming boundary the atmospheric turbulent boundary layer is introduced as a spatial turbulence intensity distribution and turbulent spectrum with random walk technique applied according to ESDU [4]. Fig. 8 shows the perturbation intensity around landing region of LHA with 45 degree yaw angle wind. The mean flow at this section was given on fig. 5. More NLDE results for LHA will also be discussed in the final paper, as will comparisons to measured LHA flow data.