What was found
DURING RETURN TO FIELD FOR STAB TRIM PROBLEM, AT 225 KIAS AT 6000 FT MSL WHEN FLAPS EXTENDED TO 5, FELT SHUDDER IN RUDDER PEDALS WHICH CONTINUED TO LANDING. MADE OVERWEIGHT LANDING AT 112000 LBS. INSPECTED AIRCRAFT PER MM 5-51 FOR OVERWEIGHT LANDING, NO DAMAGE FOUND. LUBRICATED FLAPS AND SLATS PER MM 27-51 AND OPERATED FLAPS SEVERAL TIMES, NO VIBRATION NOTED. A/C FERRIED FOR STAB TRIM PROBLEM. 03/17/2006: PERFORMED PRECAUTIONARY INSPECTION OF HORIZONTAL STAB PER MM 27-31-0 AND MM 27-41-0; LEFT AND RIGHT WING FLIGHT CONTROLS PER MM 27-11-0, 27-51-0 & 27-81-0; AND VERTICAL STAB AND RUDDER PER MM 27-21-0. NO DISCREPANCIES NOTED. (STAB TRIM PROBLEM REPORTED ON UNIQUE CONTROL NR PIDA06033)