As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AS ACFT APPROACHED, THE ACFT BEGAIN TO LIFT OFF WITHOUT PILOT IN PUT TO CONTROLS. THE GTA 82 ELEVATOR TRIM ADAPTER WENT TO FULL NOSE UP DEFLECTION WITHOUT ANY PILOT INPUT. ACFT NEARLY WENT INTO A STALL, PILOT WAS BARELY ABLE TO MAINTAIN CONTROL OF THE ACFT. GTA 82 ELEVATOR TRIM ADAPERTER FAILED IN THE FULL NOSE UP POSITION, PILOT WAS UNABLE TO ADJUST PITCH TRIM.