mm43, in your graphic showing the 50 degree bank how does the time for that event compare with the loss of signal period for the ACARS data? (Sorry, I don't have the BEA report at my fingertips. I do note a sudden 50 degree bank would move the ACARS antenna off the satellite during the event. It likely would not be able to reestablish it for the turn shown until the plane leveled out again.)
{^_^}