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Assertion (A): A wing section must be analysed for bending, shear and torsion together.

Reason (R): The air load produces all three actions simultaneously at every station.

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 are true and the second explains the first. Direct stress from bending and shear flow from torsion act at the same point in the skin, and only combining them through a failure criterion gives a meaningful strength check.

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