What was found
DURING MAINTENANCE, DISCOVERED THE RUDDER BEGAN TO FLUTTER WHEN THE SYSTEM WAS PRESSURIZED. VISUAL INSPECTION REVEALED THE RUDDER POWER CONTROL UNIT (PCU) WAS LEAKING AND VERY HOT. REPLACED THE RUDDER PCU. POWER CONTROL UNIT WAS OVERHAULED BY AERO CONTROLS, INC., 6-28-95. THIS IS THE SECOND FAILURE OF A PCU OVERHAULED BY AERO CONTROL, INC., WITHIN SIX MONTHS.