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A stringer run-out, where a stringer terminates, is a fatigue-critical detail because

  • A.No load is carried there at all
  • B.The skin is always thickest at that point
  • C.Its load transfers abruptly into the skin
  • D.The stringer is thickest at that point

Answer: C

Ending a stiffener forces its load to shear into the surrounding skin over a short length, producing a local peak stress. Tapering the run-out gradually and easing the fastener pattern are standard measures, and such details are routinely the origin of service cracking.

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