Fuel System Icing Inhibitor

Fuel System Icing Inhibitors (FSII) are chemical additives used in aviation fuels to prevent the formation of ice crystals in the fuel system. They are part of the supply class Miscellaneous Chemical Specialties in the supply group Chemicals And Chemical Products.

When aircraft operate at high altitudes or in cold weather conditions, the temperature of the fuel can drop significantly. This can cause the formation of ice crystals in the fuel, which can block fuel filters, fuel lines, and fuel nozzles, leading to engine failure.

Fuel System Icing Inhibitors work by lowering the freezing point of water in the fuel, preventing ice crystal formation. They also help to disperse any water that may be present in the fuel, reducing the risk of ice formation.

FSII is typically added to aviation fuels in small concentrations, usually around 0.1% to 0.15% by volume. It is important to use the correct type and concentration of FSII specified by the aircraft manufacturer or fuel supplier to ensure proper protection against fuel system icing.

In addition to preventing ice formation, FSII also provides lubrication to fuel system components, helping to reduce wear and extend their lifespan.

Overall, Fuel System Icing Inhibitors are essential additives in aviation fuels to ensure safe and reliable operation of aircraft in cold weather conditions.