As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) (2) KNOBS ON EITHER SIDE OF THE POWER LEVER ARE USED TO RAISE A GATE TO ALLOW REVERSE THRUST. THE KNOBS ARE SCREWED TOGETHER. DURING FLIGHT THE KNOBS SEPARATED (UNSCREWED) AND FELL OFF. THIS ALLOWED THE GATE TO PIVOT IF THE POWER LEVER WAS RETARDED ALLOWING THE ENGINE/PROP TO ENTER THE REVERSE MODE OF OPERATION. (TC NR 20080104002)