Another interesting fact, the a/p disconnected and the stick shaker activated at about 133 kts due to the ice incrament switch. Bugged ref speed was 118 kts. When the a/p disconnected and the stall warning, occured the airplane was well above its stall speed (probably somewhere around 91kts if my math is correct which is based on ref 118 being 1.3 vso). So what did happen and why did the airplane stall. The incorrect control inputs resulted in an accelarated stall which caused the airplane to stall at a faster speed than 91 kts. What is the reason for the incorrect inputs, I would guess confusion. Why the confusion, the captain had just over 100 hrs in type and all previous experience was in round dial airplanes (be1900 and sf340).