What type of fuel is primarily used by the APU in the C-130J?

The Auxiliary Power Unit (APU) in the C-130J primarily uses JP-8 fuel. JP-8 is a military-grade kerosene-type jet fuel that offers several benefits, including a lower freezing point, improved thermal stability, and compatibility with various aircraft systems.

Choosing JP-8 for the APU aligns with the operational requirements of the C-130J, as it allows for extended ground operations and reliable performance in various environmental conditions. Additionally, using a standardized military fuel like JP-8 simplifies logistics and supply considerations for operations that rely on the same fuel type across multiple aircraft platforms, enhancing mission effectiveness and reducing the risk of fuel-related issues.

While Jet A, JP-5, and Avgas are all types of fuel, they do not meet the specific operational and performance criteria required for the APU in the C-130J. For instance, JP-5 is primarily used by naval aircraft due to its higher flash point, making it less ideal for ground-based APU operations.