What is fsii additive?

FSII (Fuel System Icing Inhibitor) additive is a chemical compound that is added to aviation fuels, typically Jet A or Jet A-1, to prevent the formation of ice crystals that can clog fuel filters and disrupt engine operation. It works by lowering the freezing point of any water that might be present in the fuel, thus preventing ice from forming.

FSII additive is typically added to aviation fuel in small concentrations, ranging from 0.1 to 0.15%, depending on the severity of the icing conditions. It is also important to note that FSII additive will not prevent the formation of ice if the fuel temperature drops below its freezing point.

FSII additive is required by the FAA (Federal Aviation Administration) for all commercial aircraft operating in certain regions where icing conditions are common, such as the northern United States, Canada, and Europe. It is also recommended for use in general aviation aircraft that frequently operate in these areas.

Overall, FSII additive is an important safety measure that helps to ensure the safe and reliable operation of aircraft in cold weather conditions.