Originally Posted by
rippey
I never flew the 604, but have several thousand hours in the 601. We always took negative fuel unless pre-mixed was the only option - challenger has fuel heaters. Also the fact there was no icing inhibitor makes a situation where the fuel was contaminated by DEF unlikely. In previous cases of DEF related engine damage I believe the prist tanks on the truck were accidentally filled with DEF.
The Challenger 604 does not have fuel heaters as per say… the fuel/oil heat exchanger’s primary function is to cool off engine oil and yes heat the fuel in the engine and does not heat up the fuel in the wings… the reason why you cannot fly with bulk fuel colder than -37C.
