What are the two primary types of aviation fuel used for different engine types?

• A. Avgas and Jet Fuel
• B. Gasoline and Diesel
• C. Jet A and Jet A-1
• D. AvGas and Diesel

Answer: (A)

Aircraft engines fall into two broad categories, each needing a different fuel. Piston (reciprocating) engines run on aviation gasoline, known as avgas, which is formulated for spark-ignition and high octane performance. Jet engines (turbines) run on jet fuel, a kerosene-based fuel. In practice, jet fuel is typically used as Jet A or Jet A-1; Jet A-1 has a lower freezing point and is favored for international operations, while Jet A is common in some regions.

So, the two primary aviation fuels for the different engine types are avgas for piston engines and jet fuel for turbine engines. The other options mix in fuels not used in aviation or treat a jet fuel variant as the general category rather than the overall pairing.