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The limits of the yellow scale of an airspeed indicator are:
  • A
    VLO for the lower limit and VNE for the upper limit.
  • B
    VFE for the lower limit and VNE for the upper limit.
  • C
    VLE for the lower limit and VNE for the upper limit.
  • D
    VNO for the lower limit and VNE for the upper limit.
Here are the different speeds with the associated visual indicators (colored arcs) of an airspeed indicator:
White arc:
  • Lower limit – VS0: stalling speed with flaps extended.
  • Upper limit – VFE: maximum speed with flaps extended.
Green Arc:
  • Lower limit – VS1: stalling speed in clean configuration.
  • Upper limit – VN0: maximum speed in normal operation.
Yellow arc:
  • Lower limit – VN0: maximum speed in normal operation (can be exceeded only in still air and with caution).
  • Upper limit – VNE: Red Line - never exceed speed.

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