A C414 AT 1000 FT ON FINAL APCH DECLARED AN EMER DUE TO ELEVATOR OSCILLATING OUT OF CTL. ON GND; PLT NOTED ELEVATOR COUNTERWEIGHT AND PART OF ELEVATOR WAS MISSING.

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NOV/MON/05 I WENT THROUGH THE USUAL PREFLT PROCS. I STARTED IN THE COCKPIT AND ONCE THAT WAS COMPLETE I EXITED THE PLANE AND WORKED MY WAY AROUND THE L WING AND CONTINUED CLOCKWISE AROUND THE PLANE. I DEPARTED UTILIZING VFR AND PICKED UP FLT FOLLOWING DOWN TO ZZZ. ZZZ1 ARPT TOOK ME OVER THE TOP OF THEIR FIELD AT 2000 FT AS THEY NORMALLY DO. I DECIDED TO TAKE THE PATH TO ZZZ S AND E OF THE ANTENNAS. THE TWR HAD CLRED ME TO LAND BEHIND TFC ON A 3 MI FINAL. AS I TURNED FROM A BASE LEG TO FINAL; THE PLANE STARTED TO BUFFET AND QUICKLY INTENSIFIED. PRIOR TO THIS TIME; THE ACFT WAS OPERATING NORMALLY. I DECLARED AN EMER WITH THE TWR AND BEGAN TO TROUBLESHOOT. WHEN I VISUALLY CHKED THE CTL SURFACES OUT THE REAR WINDOWS ON THE COPLT SIDE; I COULD SEE THAT THE ELEVATOR WAS MALFUNCTIONING AND OSCILLATING OUT OF CTL. THE TWR ASKED IF I THOUGHT I COULD MAKE THE RWY AND I SAID 'YES.' THE LNDG WENT AS WELL AS COULD BE EXPECTED AND THE TWR AND ARPT STAFF WAS EXTREMELY HELPFUL. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE AIRPLANE IS STILL BEING WORKED AND STATED HIS BELIEF THAT THE INTERNAL DAMAGE WAS SOME WAY CONNECTED TO THE COUNTERWEIGHT AND PART OF THE ELEVATOR DEPARTING THE ACFT. THE RPTR STATED THAT THE ELEVATOR STRUCTURAL MEMBERS WERE SENT OUT FOR X-RAY INSPECTION. THE RPTR INDICATED THE FAA IS INVESTIGATING THIS INCIDENT VERY THOROUGHLY BUT NOTHING ON THE FINDINGS HAS BEEN RPTED; ADDING THE AIRPLANE HAS ALWAYS BEEN OPERATED IN PART 91 BUT HAS BEEN MAINTAINED IN PART 135.