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Discussion

Consider the following statements about the wing box:

1. It carries the wing bending moment through the spar caps and skins.

2. It carries the wing torsion as a closed thin-walled section.

3. It plays no part in containing the fuel.

Which of the statements given above is or are correct?

  • A.2 and 3 only
  • B.1, 2 and 3
  • C.1 and 2 only
  • D.1 and 3 only

Answer: C

The first two are correct and are why the box dominates wing design. The third is false: on most transports the box is sealed and used as an integral tank, which avoids the weight of separate bladders and uses volume that would otherwise be wasted.

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