So in due course we will know if there was anything illegal about this flight, but I doubt we'll ever know what was the sequence of events prior or after the flight into icing conditions I wonder how hard and expensive it would be to have flight data recorders installed in single engine GA planes, when they are fitted out with (part) electronic cockpits, possibly with a locating beacon. We would get so many more valuable lessons. The current FDRs are probably too expensive, but it may become cheaper with the current technology?