AnFI
Remaining on the 135 theme, you still haven't told us your experience on the 135, however there's probably no need to now, as with comments such as;
There's an answer in here somewhere and the wild speculation dept (PPRUNE) should be able to stumble accross the answer before the AAIB, shirley?
Pulled wrong FCL? LASER blinded? Medical (Heart Attack)?
... it's perfectly clear
btw when is 'no-go cold' now without FSII? -40C at alt? or subzeroC fuel temp?
According to the 135 FLM, no anti-icing additives are required down to minus 30 degC fuel temperature.
At fuel temp range -30 down to -35 an anti-icing additive is required.