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Buffet loads on a wing arise from

  • A.Cabin pressurisation cycles
  • B.Engine thrust variation
  • C.Unsteady pressures from separated flow
  • D.Steady cruise flight at low altitude

Answer: C

Separated flow produces fluctuating pressures that shake the structure, and the resulting vibration contributes both to fatigue and to the definition of the usable flight envelope. The buffet boundary is one of the limits that bounds a transport's cruise altitude and speed.

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