What was found
DURING FLT VIBRATION FELT IN ACFT AIRFRAME. VIBRATION INCREASED WITH ACFT AIRSPEED & NOT ENGINE SPEED. VIBRATION WORSE TOWARD REAR OF ACFT. VIBRATION WAS NOT FELT BELOW 190 KTS, BUT INCREASED PROGRESSIVELY AS SPEED INCREASED. CHANGING ACFT ATTITUDE DID NOT CHANGE THE VIBRATION. INSPECTED TAIL AREA & FOUND ALL 3 TRIM TABS LOOSE. ATTACHING HARDWARE LOOSE IN ROD ENDS & RUSTY. R & R LT & RT ELEVATOR TRIM TAB PUSHRODS AFT BEARINGS & BOLTS WITH NEW. R & R RUDDER TRIM TAB PUSH RODS WITH NEW. INSTALLED NEW AFT BEARINGS. TRAVEL CHECKED GOOD FOR BOTH ELEVATORS & RUDDER. ELEVATOR SERVO OPS CHECKED GOOD. ELEVATOR & RUDDER CONTROL WHEELS OPS CHECKED GOOD. WORK DONE IAW MM 27-21-05.