The specific developments of Dutch roll mode have shown a number of flight dynamics deficiencies, prevailing in aircraft with fixed (non-assisted) IntroductionSchool and training aircraft are usually equipped with conventional control systems, nonassisted mechanical systems. These planes have a low damping factor at speeds above Mach 0.3 and altitudes of over 5000 m. The proposed analysis is based on research made on military school and training aircraft IAR-99. With this category of aircraft an unsatisfactory level of damping oscillations was found, especially in the missions requiring Dutch roll mode specific developments. According to calculations of stability, the damping factor of the

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