Why are turbine fuels more prone to water contamination compared to aviation gasoline?

Turbine fuels, such as Jet A or Jet A-1, are more prone to water contamination primarily due to their chemical and physical properties. The correct aspect to consider here is related to the volatility and evaporation characteristics of the fuels involved.

Turbine fuels are less volatile than aviation gasoline. This means that, under certain conditions, they do not evaporate as quickly as gasoline does, which can allow water to settle and accumulate in the fuel system. Consequently, during the operation of turbine engines, any presence of water can lead to issues like microbial growth, fuel system corrosion, or ice formation in the fuel lines, impacting engine performance and safety.

While viscosity, weight, and additives affect fuel behavior, the primary reason for the increased risk of water contamination in turbine fuels compared to aviation gasoline is closely linked to their volatility characteristics. Aviation gasoline tends to evaporate rapidly, reducing the likelihood of water accumulation, whereas the denser nature of turbine fuels allows for potential water retention. Thus, the correct understanding reflects on the volatility and operational characteristics of the fuels, rather than solely their viscosity.