Discussion
The lateral-directional characteristic equation of a conventional aeroplane normally yields
Answer: A
The quartic splits into three recognisable pieces: the Dutch roll as a complex pair, the roll subsidence as a large negative real root, and the spiral as a small real root that may sit on either side of the origin. That is why the lateral problem has three named modes where the longitudinal has two. Two complex pairs would describe two oscillations, which the lateral problem does not have. Four large negative real roots would leave no oscillation at all. A single pair accounts for only two of the four roots.
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