Original text - Engels - Wing anti-icing valves returned from service have...

Wing anti-icing valves returned from service have revealed a secondary corrosion problem. The condition takes the form of white corrosion products on, and blistering of the the chromed bore of the valve body assembly. Corrosion around the shaft and its bearings has also been reported. The extent of this corrosion fault is not known nor if it is time- or time- and temperature-related