What is the minimum engine fuel temperature indication for takeoff?

The minimum engine fuel temperature indication for takeoff is +5°C. This temperature limitation is crucial because jet fuel can become less effective at low temperatures, which could lead to issues such as fuel gel formation and could affect the fuel flow to the engines. Operating with fuel temperatures below this threshold can increase the risk of engine performance issues or malfunctions during critical phases of flight, such as takeoff.

By ensuring that the engine fuel temperature is at least +5°C prior to takeoff, the aircraft maintains optimal fuel performance and reduces the likelihood of encountering engine issues that could compromise safety during flight operations. This temperature limitation is set to ensure that the fuel remains at a viscosity that allows for proper engine function and promotes efficient combustion.