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

Illuminated –

  • Bright – related cowl anti–ice valve is in transit, or, cowl
    anti–ice valve position disagrees with related ENGINE ANTI–
    ICE switch position.

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

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