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An aircraft's design cruising speed VC is set below VD so that

  • A.The cabin can be pressurised
  • B.An overspeed does not exceed the design case
  • C.The engines run more economically
  • D.The stall speed is reduced

Answer: B

The margin between cruise and dive speeds accommodates upsets, control failures and a descent at maximum thrust before the design limit is reached. The regulations prescribe minimum separations between the two, so it is a certification requirement rather than a preference.

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