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Constant-section fuselage barrels are used wherever possible because they

  • A.Allow stretch plugs to be added
  • B.Reduce the aircraft's drag
  • C.Improve pressurisation
  • D.Increase the cabin's width

Answer: A

A parallel middle section can be lengthened by inserting plugs fore and aft of the wing, which is how nearly every family stretch is achieved. It also makes frames, panels and tooling repeatable rather than each one unique.

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