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The principal structural element of a wing that carries the bending moment is

  • A.The spar caps and the wing skins
  • B.The ribs
  • C.The trailing-edge fairing
  • D.The leading-edge slat

Answer: A

Spar caps at the top and bottom of the box, acting with the skins, form the flanges of a deep beam and take the bending as direct tension and compression. The spar webs carry the vertical shear, and the ribs neither bend nor shear appreciably in the spanwise sense.

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