Dutch roll refers to which flight dynamic?

• A. A combination of rolling and yawing oscillations that occur when dihedral effects exceed directional stability
• B. A static roll stability condition
• C. A spin with adverse yaw
• D. A controlled oscillation in pitch only

Answer: (A)

Dutch roll is a coupled lateral-directional oscillation where roll and yaw feed into each other. It happens when the dihedral effect—the tendency for a bank to produce a yawing moment and stabilize by raising one wing—interacts with directional stability, so a disturbance causes rolling motion that generates yaw, which then reinforces the roll. This dynamic, oscillatory behavior involves both axes, not just one, and it arises from the coupling between roll and yaw.

This is why the description describing a combination of rolling and yawing oscillations that occur when dihedral effects exceed directional stability is the best fit. It captures the dynamic, interactive nature of the motion.

It isn’t a static roll stability condition, since Dutch roll is about ongoing roll–yaw coupling rather than a single, non-oscillatory tendency. It isn’t a spin with adverse yaw, which involves a different stall/spin dynamic, and it isn’t a controlled oscillation in pitch only, since the hallmark of Dutch roll is the interaction of roll and yaw, not pitch.