Which mechanism compromises stability when an aircraft's yaw damper control system malfunctions?

💡 Explanation

When a yaw damper malfunctions, the rate damping decreases causing energy inserted in yaw axis stimulating the 'Dutch roll' oscillations because unstable oscillatory mode leads to sustained, possibly divergent motion. Therefore, 'Dutch Roll' amplification results, rather than decreased elevator effectiveness, autorotation, or aileron lock, which depend on entirely different control mechanisms and failures.

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