A CANADAIR CL65 IN CLB AT FL300 DECLARED AN EMER AND DIVERTED DUE TO LOCKED AILERONS CAUSED BY AILERON UNITS IN MAIN GEAR WELL FROZEN.

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CLBING THROUGH FL300; WE GOT AN 'AUTOPLT TRIM RWD' CAUTION MSG. AFTER RESETTING THE AUTOPLT; THE MSG RECURRED. WHEN I TRIED TO TURN THE ACFT BACK TO THE COURSE; I REALIZED THE AILERON CTL WAS JAMMED. THE CAPT'S SIDE WAS ALSO JAMMED. WE RAN THE QRH PROCEDURE FOR JAMMED AILERONS. AFTER DISCONNECTING THE 'ROLL;' BOTH SIDES WERE STILL UNABLE TO MOVE. WE DECLARED AN EMER AND DIVERTED. UPON DSCNT THROUGH ABOUT 16000 FT; THE FLT CTLS BROKE FREE. SINCE WE STILL DID NOT KNOW THE NATURE OF THE PROB; WE RETAINED EMER STATUS AND REQUESTED EMER EQUIP AT ZZZ. THE APCH AND LNDG WERE UNEVENTFUL. CONTRIBUTING FACTORS MAY HAVE BEEN VERY HEAVY RAIN AT OUR DEP ARPT. ONE MORE NOTE; ON LNDG AT ZZZ; THE EMER EQUIP WAS NOT ROLLED; THOUGH IT HAD BEEN REQUESTED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE AIRPLANE WAS TAXIED FOR TKOF IN A HEAVY RAIN SHOWER. PASSING THROUGH FL300; THE AUTOPLT TRIM RWD CAUTION MSG ILLUMINATED AND RESET WAS NO HELP. IN TRYING TO MOVE THE AILERONS; IT WAS DISCOVERED NO AILERON CTL WAS POSSIBLE. THE CTLS WERE SPLIT; BUT THE AILERONS WERE STILL LOCKED. AFTER DECLARING AN EMER AND DSNDING TO 16000 FT; THE AILERONS BROKE FREE. THE RPTR SAID VARIOUS METHODS HAVE BEEN TRIED TO AVOID WATER SOAKING THE AILERON COMPONENTS IN THE MAIN WHEEL; ALL UNSUCCESSFUL.