At what bulk fuel temperature is takeoff prohibited for Jet A?

Takeoff is prohibited for Jet A fuel at temperatures below -30°C due to the potential for fuel to reach a state where it has increased viscosity, which can lead to difficulties in fuel flow and atomization in the engines. Jet A fuel's pour point is around -40°C, but operational considerations specify a higher limit to ensure optimal performance and safety during flight operations. Keeping the fuel temperature above -30°C helps prevent problems such as wax formation, which can clog fuel filters, and ensures that the fuel is adequately conditioned for efficient combustion in the engines. This threshold is an important safety measure in aviation operations, aimed at maintaining reliability and performance during critical phases like takeoff.