Boeing 737 NG Systems Review
Forward Overhead Panel  700/800/900
Display Selector
Wing and Engine Anti - Ice Panel
Wing Anti–Ice VALVE OPEN Lights

Illuminated –

  • Bright – related wing anti–ice control valve is in transit, or,
    related wing anti–ice control valve position disagrees with
    WING ANTI–ICE switch position.

  • Dim – related wing anti–ice control valve is open (switch
    ON).

  • Extinguished – related wing anti–ice control valve is closed
    (switch OFF).