On 24 May 2011, a sudden uncommanded maximum upward deflection of the trimmable horizontal stabiliser occurred to a descending Dassault Falcon 7F. Automatic opposite elevator movement did not resolve the situation and an upset lasting just over 2½ minutes followed with a 9,500 feet climb at up to 41° pitch and a speed drop to 125KCAS. Only autonomous return of normal pitch response ended the control difficulty. The remainder of the flight was without further event. A single suddenly defective component with no effective crew response available and not anticipated during type certification was found to have caused the runaway.