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If aircraft continues to go farther away from equilibrium position after being disturbed then, the aircraft is called _______

(a) unstable

(b) stable

(c) statically stable

(d) neutrally stable

This question was posed to me during a job interview.

This question is from Longitudinal Static Stability and Control-1 topic in chapter Stability, Control, and Handling Qualities of Aircraft Design

1 Answer

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Best answer
Right choice is (a) unstable

Best explanation: If after being disturbed from the equilibrium position, aircraft tends to go further away from the original equilibrium position then it is said that the aircraft is not stable or it is Unstable. It will be called neutrally stable if it attains new equilibrium position however it is not mentioned in the question so the correct answer will be unstable.

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