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Which of the following is NOT a source of unsteady loading on an airframe?

  • A.Atmospheric turbulence
  • B.Vibration transmitted from the engines
  • C.Steady cruise in smooth air at constant altitude
  • D.Transonic buffet from shock-induced separation

Answer: C

Steady flight in smooth air produces a constant load and contributes nothing to the fatigue spectrum beyond the mean stress. The other three all produce fluctuating loads that accumulate damage over the aircraft's life.

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