Looks to me like the snow on the ground probably did much for saving the aeroplane and it's occupents.
It is too early to speculate who the heroes and villains are, and where any faults lie. However, I seem to remember a SAS MD81 crashing some years back after takeoff due to ice breaking from the wings and entering the rear mounted engines. Anyone else remember it and could it be a possibility with the F70?
ES