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The ground-air-ground cycle is significant for fatigue because it

  • A.Affects only the engines
  • B.It reverses the wing bending once per flight
  • C.Occurs only during maintenance
  • D.Applies no load to the structure

Answer: B

On the ground the wing hangs down under its own weight and the gear reaction; in flight it bends upward under lift. That full reversal happens once per flight and is one of the largest single contributors to the fatigue damage a wing accumulates.

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