Which term describes the stability category that is not damped?

• A. Positive dynamic stability
• B. Neutral dynamic stability
• C. Negative dynamic stability
• D. Static stability

Answer: (B)

Dynamic stability looks at how an aircraft’s motion evolves after a disturbance over time. If the motion dies away, returning toward the original attitude, that’s positive dynamic stability. If the aircraft keeps oscillating with the same size motion, it isn’t damped, which is neutral dynamic stability. If the oscillations grow, the response is negative dynamic stability and the aircraft becomes unstable. Static stability, on the other hand, is about the initial tendency right after the disturbance—whether the airplane tends to return or diverge before any motion is considered over time. So the term that describes a not-damped, ongoing motion is neutral dynamic stability.