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What Is a Dutch Roll, and Is It Dangerous?

Pilot Institute

Longitudinal Stability Longitudinal stability exists about the pitch axis. Placing the center of gravity ahead of the aircraft’s center of lift improves longitudinal stability. The aircraft’s horizontal stabilizer (tailplane) creates a downward lift to counterbalance pitching moments.

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The Hazards of Aircraft Icing: Explained

Pilot Institute

Additional Dangers of Ice Accumulation Icing also makes your aircraft heavier and can even change the position of the center of gravity. It most commonly forms on the leading edges of your aircraft, including the wings, tail, and horizontal stabilizer, as well as on the propeller blades and pitot tubes.

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Nothing Small About It

Plane and Pilot

Just recognizable in the background is a horizontal stabilizer and one-piece elevator. Nudging it back to center slid the ball a diameter the other way—trying to corral it in the middle was a bit pointless as it didn’t want to live there. I think I’d have figured out the trick in another couple hours.