This thread is going nowhere, as many others. The 604 is a good aircraft, with a fabulous wing. As with any other swept wing bird you don't take chances with ice, you watch your speed and you don't overrotate. Anyone with 20-30 hours on the plane will have learned to respect the above three. Any pilot within Europe is well versed with its handling in all above three scenarios especially in icing. Whatever reason the Russians ultimately give for the accident will be backed up by scientific data or else it will have no merit. Lets wait and see what comes out.