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Assertion (A): Directional and lateral stability must be considered together.

Reason (R): A single sideslip disturbance produces both yawing and rolling moments.

Select the correct answer from the options below.

  • A.A is false but R is true
  • B.Both A and R are true, and R is the correct explanation of A
  • C.Both A and R are true, but R is not the correct explanation of A
  • D.A is true but R is false

Answer: B

Both statements are true and the second is the reason. The balance between the two determines whether the aeroplane exhibits a badly damped Dutch roll or a divergent spiral, which is a matter of handling rather than of either axis alone.

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