What occurs when the fuel temperature falls below 21C?

When the fuel temperature falls below 21°C, oil flows through the exchanger. The Pilatus PC-12 NG utilizes a fuel/oil heat exchanger to maintain appropriate fuel temperatures for optimal performance and to prevent issues such as fuel icing or vapor lock. When the temperature drops, the system allows warmer oil to flow through the exchanger, which helps to heat the fuel to maintain its viscosity and prevent it from becoming excessively cold. This ensures that the fuel remains in a condition suitable for efficient engine operation.

The mechanism of oil flow through the exchanger serves a critical role in managing the fuel system’s overall efficiency and effectiveness, enhancing reliability and performance during flight.