What was found
AT ABOUT 1000 FT ON FINAL JUST AFTER TURNING AUTOPILOT OFF AILERONS WERE LOCKED UP. AFTER ABOUT 15 TO 20 SECONDS THEY BECAME NORMAL. OPERATED AUTOPILOT WITH ALL 3 HYDRAULIC SYSTEMS, ALSO WITH INDIVIDUAL SYSTEMS ARMED, CONTROL AND INDICATION NORMAL. AP DISCONNECT SWITCHES CAPTS AND F/OS AND FCP ALL CHECK GOOD WITH WARNINGS AND FLIGHT CONTROLS (AILERON) DISCONNECTED NORMAL. OVERRIDE OF AILERONS NORMAL, NO PHYSICAL ABNORMALITIES NOTED ON FLIGHT CONTROL SURFACE. REF CL600 MM 22-11-21, 22-11-02.