Hi all,
I have heard that flying over very cold regions for long times, the outer wing tank fuel temp. of some A340's have fallen down to -40 and the crew did descent in order to increase the fuel temps.
Just wondering, the outer wing tanks are used only when all other fuel is used (ie center tank, trim tank and most of the inner wing tanks) (on the A340), and the big bird will be at this time over hot regions.
So, my question is if the fuel temp (for JetA1) gets as cool as -47 (max. freezing point) or even lower and afterwards this fuel is heated again can it still be used or is there any chemical formation that makes the fuel unusable.
