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Below the optimum cruise altitude...
  • A
    the Mach number for long range cruise decreases continuously with decreasing altitude.
  • B
    the IAS for long range cruise increases continuously with decreasing altitude.
  • C
    the TAS for long range cruise increases continuously with decreasing altitude.
  • D
    the Mach number for long range cruise increases continuously with decreasing altitude.

Refer to figure.

Long-Range Cruise (LRC) speed is the traditional cruise speed. It has been historically defined as the speed above Maximum-Range Cruise (MRC) speed with a 1 percent decrease in fuel mileage, but a 3-5% gain in cruise velocity.
It is derived as an EAS from the total drag curve at 1.37 VMD.

  • Take a look at the attached graph, if "E" is kept constant, Mach number for LRC increases as altitude increases. Likewise, it will decrease with decreasing altitude.

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