The comment on staying out of icing conditions is spot on! Deicing equipment buys you time to find a way out, not to continually fly in icing. I agree with the NTSB as far as the Cessna Caravan is concerned. Never saw any ice bridging in that airplane. On the other hand I never stayed in icing in that airplane for long due to the Caravan not carrying ice very well. Most of my Caravan flying was done in the Great Lakes area. Until the icing AD that came out in 2006, there was an average of one pilot per year getting himself into ice that overwhelmed the airplane resulting in a crash. The one that crashed in Wisconsin in 2002, that pilot was a friend of mine. The Caravan has so much unprotected surfaces, and little extra power, that collected ice can easily bring one down if remaining in icing too long. When I moved up to jets I found all that excess power available at low altitudes helps keep those planes in icing a little longer, but still would prefer to minimize staying in those conditions. I suppose older planes might have the ice bridging issue but I have no experience in any of those so I can’t directly comment on that.