For information only:
In its Dec. 15 letter to the FAA, the NTSB cited 26 icing-related Caravan accidents from 1987 to 2003, killing 36. Most occurred within the parameters of the icing envelope used for certification purposes (Appendix C). Ten of the 26 events involved inadequate removal of ice before takeoff. The NTSB noted that both visual and tactile checks for any ice on the upper surface of the high-wing airplane is difficult, but it is essential that such checks be done to make sure the wing is absolutely clear of ice.
Aviation Week Jan 3 2005