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A doubler fitted around a cut-out works by

  • A.Reducing the aircraft's drag
  • B.Insulating the cabin
  • C.Adding material to carry the diverted load
  • D.Sealing the opening against pressure loss

Answer: C

The doubler restores the section that the opening removed, in the region where the load must flow round it. Sizing it is a balance: too little and the corner stress stays high, too much and the stiffness discontinuity simply moves the problem to the doubler's own edge.

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