Which fuel type is NOT acceptable for use in the T-6A?

The T-6A is designed to operate on specific types of aviation fuel that are compatible with its engine and system requirements. Jet A and Jet A-1 are kerosene-based fuels that meet the necessary specifications for turbine engines like the one used in the T-6A. Jet B, while less commonly used, is also a kerosene type fuel that is acceptable under certain conditions.

AvGas, or Aviation Gasoline, is formulated for piston engines and does not meet the operational needs of the T-6A's turbine engine. Using AvGas in a turbine engine can lead to significant operational issues, including reduced performance and potential damage to the engine. Therefore, it is critical to adhere to the manufacturer’s fuel specifications to ensure safe and efficient operations.