2 / 20
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.

Your Notes (not visible to others)



This question has appeared on the real examination, you can find the related countries below.