What was found
ACFT AGGRESSIVELY ROLLED RT WHEN FLAPS SELECTED FROM 30 TO 45. REQUIRED MORE THAN HALF SCALE LWD AILERON TRIM, AT WHICH TIME AILERON CONTROL BECAME ERRATIC DURING NORMAL CORRECTIONS. THERE WAS 'NULL' ZONE AT CENTER OF AILERON TRAVEL AND 'JERKS' WITH SMALL LT AND RT AILERON INPUTS. AUTOPILOT OFF. EMERGENCY DECLARED FL 5300, PERFORMED RIG CHECK OF AILERON CONTROL SYS IAW AMM 27-11-00, PERFORMED OPS TEST OF AILERON CONTROL SYSTEM IAW AMM 27-11-00, PERFORMED OPS TEST OF FLAP CONTROL SYS IAW AMM 27-51-00, CLEANED FLAP UPPER SURFACE AT SEAL POINT TO T/E OF WING SURFACE IAW AMM 51-26-00. PERFORMED FUNCTIONAL TEST OF FLAP FECU IAW AMM 27-51-05, NO DEFECTS NOTED AT THIS TIME.