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A slat differs from a Krueger flap in that a slat is fitted

  • A.To the trailing edge
  • B.Inside the wing box
  • C.Only on the lower surface
  • D.To the leading edge, forming a slot

Answer: D

Both are leading-edge devices, but a slat opens a slot that ducts high-energy air over the upper surface, while a Krueger hinges forward from below to extend the lower surface. Slats are more effective and more complex.

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