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A stringer differs from a longeron chiefly in that a longeron is

  • A.Always made of composite material
  • B.Oriented circumferentially rather than axially
  • C.Attached only to the frames and never to the skin
  • D.Fewer and heavier, taking more bending

Answer: D

Both run lengthwise, but a longeron is a heavy member used in small numbers, while stringers are light and numerous. The distinction matters for how the bending load is shared and how much skin each member has to stabilise, and modern transports favour many stringers.

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