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A wing-to-fuselage joint on a large transport is usually made through

  • A.A single pin at the wing root
  • B.The undercarriage attachment
  • C.Fittings taking spar loads into frames
  • D.The skin alone, with no fittings

Answer: C

The wing root delivers very large bending and shear loads, so machined fittings take them from the spars into a group of strengthened frames and the centre section. The centre wing box carries the bending straight across the fuselage, which is why it is not interrupted.

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