What is the temperature limitation for the fuel system?

The temperature limitation for the fuel system, which is indicated as -40° to 50°C, is primarily important for ensuring that the fuel remains within its operational specifications for performance and safety. This range avoids issues related to fuel viscosity and the risk of fuel freezing at low temperatures, which can hinder the fuel flow and lead to engine performance problems. At the high end of the scale, maintaining fuel temperatures below 50°C is vital to prevent thermal degradation of the fuel, which could lead to the formation of vapors or reduced fuel efficiency.

Other ranges provided do not align with the operating guidelines typically established for effective fuel system performance. For instance, more extreme temperature ranges could potentially compromise the integrity of the fuel or the efficiency of the fuel system due to changes in density or combustion characteristics. Therefore, the selected temperature limitation reflects a careful consideration of the operational environment in which the aircraft is likely to function, ensuring reliable and efficient operation.