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Discussion

Noise certification requirements affect design principally through

  • A.The choice of cabin materials
  • B.The structural material selection
  • C.The avionics architecture
  • D.Bypass ratio and nacelle treatment

Answer: D

Chapter 14 limits are measured at defined points on take-off, sideline and approach, and meeting them shapes the engine cycle and the nacelle acoustic lining. Airframe noise from gear and high-lift devices matters increasingly as engines have quietened.

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