What was found
(H12R) PREFLIGHT CONTROL CHECKED GOOD, THE ELEVATOR WAS HITTING THE CONTROL STOPS, ON TAKEOFF THE ACFT HAD PARTIAL ELEVATOR CONTROL, ON LANDING THE ACFT HAD PARTIAL ELEVATOR CONTROL, BEFORE FURTHER FLIGHTS THE CONTROLS WERE CHECKED, THE ELEVATOR BELLCRANK BRACKET WAS FOUND BROKEN OFF OF ITS ATTACHMENT TO THE SPAR. THE RIVETS WERE WORN THRU AND THE HOLES WERE ELONGATED. THE 15,000+ HOURS ON THE PART AND THE LACK OF MX AND PROPER INSPECTIONS ARE THE REASONS FOR THIS PART FAILURE.