Which type of fuel is typically not suitable for aviation use?

Diesel Fuel is typically not suitable for aviation use because it does not meet the specific requirements for aircraft engines, particularly turbine engines, which are predominantly used in commercial aviation. Aviation fuels like Jet A and JP-5 are specifically formulated to provide the necessary characteristics required for high-performance aircraft, including proper combustion properties and freezing point specifications for high-altitude flights.

Jet A and JP-5 are kerosene-based fuels designed for jet engines, while Avgas (aviation gasoline) is used in piston-engine aircraft. Each of these fuels has distinct properties that align with the operational needs and safety standards for aviation. Diesel, on the other hand, has a different combustion process and may not vaporize correctly at the required temperatures, making it ill-suited for aviation use. Its higher flash point and different viscosity profile do not ensure safe operation in an aviation context.