What issue can arise from the use of turbine fuels in aircraft?

Microbial contaminants can indeed be a significant issue when using turbine fuels in aircraft. Turbine fuels, particularly Jet A and Jet A-1, provide an environment that can support the growth of certain types of bacteria and fungi, especially when water is present in the fuel system. These microorganisms can thrive in the fuel, leading to the formation of biomass, which can result in sludge and other contaminants that may clog filters, corrode fuel lines, and, in severe cases, cause engine malfunctions.

The presence of water is critical as it can enter the fuel system from various sources, including condensation. This contamination can compromise the integrity of the fuel, affecting combustion and potentially leading to operational issues. Regular testing and maintenance of fuel systems are necessary to mitigate this risk and ensure the safety and efficiency of aircraft operations.

In contrast, while fuel freezing at high altitudes, increased carbon deposits, and higher volatility are relevant concerns in the context of aviation fuels, microbial contamination specifically addresses a biological risk that can arise directly from the unique characteristics of turbine fuels.