BE100 FLIGHT CREW REPORTS ELEVATOR FREEZING (LITERALLY) IN CRUISE AT 17000 FEET. DESCENT TO LOWER ALTITUDE AND WARMER AIR ALLOWS NORMAL CONTROL TO BE REGAINED. FAA REVIEW DISCOVERS THAT FIRST OFFICER IS NOT PART 135 CURRENT ON THIS AIRCRAFT.

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I WENT OUT TO THE ACFT AND OBTAINED THE CLRNC. THE CLRNC WAS OBTAINED 30 MINS PRIOR TO DEP. WE DEPARTED APPROX XA30. I OBTAINED THE CLRNC; TALKED WITH GND; TWR; AND AT LEAST THE FIRST 2 OR 3 CTLRS. I AT NO TIME MANIPULATED THE FLT CTLS. APPROX 40 MINS AFTER DEP; AND IN CRUISE FLT; THE CAPT NOTED THE ELEVATOR BEING VERY STIFF AND; AFTER A COUPLE MORE MINS; THE ELEVATOR COULD NOT BE MOVED AT ALL IN EITHER DIRECTION. THE CAPT ASKED FOR A LOWER ALT; SINCE WE WERE STILL IN RAIN WITH ICING (LIGHT RIME) AND HAD ACCUMULATED APPROX 3/4 INCH ON THE LEADING EDGES. HE SLOWLY REDUCED PWR AND WAS CTLING THE DSCNT WITH THE STABILIZER TRIM. AT APPROX 13500 FT MSL; THE ELEVATOR BROKE FREE AND HE MADE A NORMAL LNDG. THE CAPT WAS TALKING WITH CTR AND THEY HAD DECLARED AN EMER FOR US; HOWEVER; HE CANCELED THE EMER JUST BEFORE BEING HANDED OFF TO APCH. I DO NOT HAVE A CURRENT PART 135 CHK RIDE IN THE KING AIR; HOWEVER; I AM QUALIFIED. I DO HAVE CURRENT PART 135 SIC CHK RIDES IN THE COMPANY'S OTHER ACFT. THE CONQUEST IS DOWN FOR MAINT; AND I AM ON SALARY; SO I WAS PUT ON THE KING AIR TRIP AS AN OBSERVER; NOT TO FLY. THE CAPT IS SINGLE PLT QUALIFIED. ON SEVERAL OCCASIONS; I TALKED TO CTR ON THE RADIO. I DID NOT BELIEVE TALKING ON THE RADIO WAS ACTING AS A CREW MEMBER. SUPPLEMENTAL INFO FROM ACN 812815: FLYING ALONG AT 17000 FT; 10 DEGS CELSIUS; OAT ELEVATOR CTL FROZE. NOTIFIED CTR OF OUR PROB. THEY SAID THEY WOULD DECLARE AN EMER FOR US. I REQUESTED AND WAS GIVEN LOWER ALTS TO GET INTO WARMER AIR. BEFORE REACHING 11000 FT; ELEVATOR CTL WAS REGAINED. CHANGED CTR FREQ. WAS ASKED IF EMER STILL EXISTED AND WE SAID NO; EVERYTHING WAS NORMAL. THEY SAID THEY WERE CANCELING EMER STATUS. CONTINUED TO DEST AND LANDED NORMALLY.