I flew back from USA last week and SAT was -72, TAT was -43. I was keeping a very close eye on the fuel temp in the outer tanks as I had Jet A fuel (freezing point -40). A descent into warmer air or increase in speed will increase TAT, or you can transfer fuel before it reaches freezing point.
Last edited by SidHolding; 21st March 2013 at 19:59.