Fuel Temperature Low

When fuel temperature is approaching the fuel temperature limit (3°C above the fuel freeze point or -45°C whichever is higher): Increase speed, change altitude and/or deviate to a warmer air mass to achieve a TAT equal to or higher than the fuel temperature limit. TAT will increase approximately 0.5 to 0.7°C for each .01 Mach increase in speed. In extreme conditions, it may be necessary to descend as low as FL250.