wally:
wallybird: Two posts in a row state as facts about the aircraft flight into a defined thunderstorm without deviation.
A course deviation of 12 degrees was recorded before this upset event. It's in the BEA report. Was the deviation big enough? Different question.
I'll echo Saturn V's other point: defined thunderstorm conclusion is based upon what criterion? That they knew they were flying into unstable air seems to be confirmed by the brief CVS discussions released to date, and the apparent decision to reduce speed to turbulent air penetration speed before they hit what they expected to be a patch of the rough stuff.