What was found
AIRCRAFT EXPERIENCED WING FLUTTER ON CLIMB-OUT PASSING 6000 FT STEADY 250KIAS WHILE TURNING. NO ABNORMAL YAW, NO ABNORMAL INDICATION ON FLIGHT CONTROL ECAM PAGE. NO ABNORMAL INDICATION ON HYD ECAM PAGE. ONSET OF FLUTTER WAS FASTER AT HIGHER SPEED. MAX SPEED WAS 307, MAX ALTITUDE WAS FL 240. FLUTTER IN TURN (ROLL IN / ROLL OUT) CONTINUED THROUGH OUT THE FLIGHT. FLIGHT CREW DECLARED EMERGENCY AND RETURNED TO FIELD. TECHNICIANS DUPLICATED FAULT WITH RT GREEN AILERON SERVO ACTUATOR FLUCTUATING DURING TROUBLESHOOTING PROCEDURE. REMOVED AND REPLACED GREEN SYSTEM RT AILERON SERVO ACTUATOR (FIN 33CE2) IAW AMM 27-14-51. NO LEAKS NOTED, OPERATION TEST NORMAL IAW MM 27-14-00.