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The vertical fin's side load is reacted into the fuselage principally through

  • A.The forward pressure bulkhead
  • B.The main undercarriage attachment
  • C.The wing front spar
  • D.Reinforced frames and the shell in torsion

Answer: D

The fin acts as a cantilever whose root moment must be reacted by the rear fuselage, so heavy frames pick up the spar loads and the shell carries the resulting torsion forward. This is why the rear fuselage of a transport is so noticeably reinforced.

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