As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ACFT REPORTED STIFF RT ELEVATOR TRIM IN FLIGHT, BUT TRIM ACTUATION WAS NORMAL ON THE GROUND. IT WAS FOUND THAT WHEN THE ELEVATOR WAS PLACED IN A NEUTRAL POSITION, THE TRIM WOULD BEGIN TO BIND. THE PHENOLIC PLATE THAT IS RIVETED ONTO THE CHAIN GUARD OF THE TRIM TAB ACTUATOR WAS FOUND TO BE BOWED AND RIVETS NOT PRESSED ENOUGH WHICH CAUSED THE CHAFING OF THE TRIM CHAIN. THE RT TRIM TAB ACTUATOR WAS AN O/H UNIT INSTALLED ON THE ACFT.