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Tear straps bonded or riveted to a pressurised fuselage skin serve to

  • A.Carry the fuselage bending moment
  • B.Stiffen the skin against buckling in shear
  • C.Seal the cabin against leakage
  • D.Arrest a running crack and confine the damage

Answer: D

By providing a local increase in fracture toughness and load path, a tear strap turns a crack that would run for many frames into one that stops at a bay boundary. The result is a controlled decompression rather than a catastrophic failure, which is the central idea of damage tolerance.

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