A CPR SMT STALLED WHEN TRYING TO CLB TOO HIGH.

Narrative

WHILE LEVEL AT FL220 AWAITING CLRNC TO FL240 IN ORDER TO TOP COLUMBUS MOA; I WAS PICKING UP RIME ICE AND ASKED TO BEGIN CLB TO FL240 HOPING TO GET BACK IN SUNSHINE. WAS CLRED TO FL230 WHICH WAS NO PROB AND OUT OF ICE ACCUMULATION. SEEMED TO BE ALMOST ON TOP. WAS HANDED OFF TO HIGH ALT CTLR AND CLRED TO MAINTAIN FL240. I STARTED THE CLB AT APPROX 500 FPM INDICATING 140 KIAS. AT 23900 FT I FELT STALL BUFFET AND IMMEDIATELY LOWERED THE NOSE. WAS INDICATING 130 KIAS AT THAT TIME. BY THE TIME STALL RECOVERY WAS COMPLETED; I WAS AT 23500 FT AND I ADVISED THE CTLR THAT I HAD TO DSND. HE ADMONISHED ME THAT I SHOULD FIRST TELL HIM. I ADVISED HIM THAT I HAD NO CHOICE AT THE TIME AND WAS CLBING BACK TO FL240. AGAIN AT 23900 FT; 130 KIAS THE SAME THING HAPPENED. I ADVISED THE CTLR. HE TOLD ME TO MAINTAIN FL230 AND CONTACT A DIFFERENT CTLR FOR ROUTING AROUND MDA. I CAN ONLY ASSUME THAT THE STALL OCCURRED DUE TO ICE BUILDUP ON THE BOTTOM OF THE WING. VISIBLE ICE ON THE LEADING EDGE WAS NO MORE THAN 1/4 INCH; NOT ENOUGH FOR BOOTS TO BREAK. I HAD NO PROB MAINTAINING FL220 OR 230 FOR THAT MATTER AND NORMAL INDICATED AIRSPD FOR THE BE100. AND I THOUGHT I WAS ALWAYS AWARE OF ICE ACCUMULATION. MY PRACTICE HAS BEEN WHEN IN ANY ICE AND I LOSE 5 KTS AIRSPD IN LEVEL FLT START LOOKING FOR OUT. BE MORE AWARE OF ICE BUILDUP BENEATH THE WING.