Speed Reference Selector
Speed Reference Selector (Outer Knob)

Sets the reference airspeed bugs on the Mach/airspeed indicator:

  • AUTO – the reference airspeeds and gross weight are
    provided automatically through the FMC.
  • V1 – used to manually set decision speed on the ground; in
    flight, displays “INVALID ENTRY”.
  • VR – used to manually set rotation speed on the ground; in
    flight, displays “INVALID ENTRY”.
  • WT – allows manual entry of reference gross weight.
  • VREF – used to manually set the landing reference speed
    in flight; on the ground, displays “INVALID ENTRY”.
  • Bug 5 – used to manually set the white bug 5 to the
  • desired value.
  • SET – removes the speed reference display.

Speed Reference Selector (Inner Knob) (Two speed slew)

ROTATE –

  • Manually sets the appropriate reference airspeed or gross
    weight.
  • The digital display appears below the airspeed indication.
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