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The limits of the yellow arc (caution speed range) of an airspeed indicator are…

  • A

    VNO for the lower limit and VNE for the upper limit.

  • B

    VLE for the lower limit and VNE for the upper limit.

  • C

    VLO for the lower limit and VNE for the upper limit.

  • D

    VFE for the lower limit and VNE for the upper limit.

Refer to figure.
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 – VNO: maximum speed in normal operation.

Yellow arc:

  • Lower limit – VNO: maximum speed in normal operation.
  • Upper limit – VNE: Red Line - never exceed speed.

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