Gipsy Queen, Jet-A freezing point is -40c, Jet-A1 freezing point is -47c, TS-1 as supplied in Russia and Beijing has a lower freezing point of -50c. If your tank fuel temperature reaches 3 degs. above the freezing point of fuel carried, you have to take steps to avoid a further drop of fuel temp by either increasing your cruise Mach number or descending to a lower flight level with a higher OAT.
Fuel temperature on the 777 is displayed in white on the primary EICAS in the lower right corner. If the fuel temperature reaches the established minimum, the indication turns amber in color and the FUEL TEMP LOW advisory message is displayed. The 777 system automatically defaults to the limit associated with the highest freezing point of fuel approved for use on the 777, which is –37°C for Jet A fuel. However, the EICAS message can be set to other values. For example, if Jet A-1 fuel is used, the message can be set to –44°C