Originally Posted by
Compton3fox
There is a suggestion that fuel icing may have been at play here. 350 gallons uploaded in OSU but without anti ice agent. May or may not be a factor but a possibility... They flew down at FL400.
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.