As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) A SCREW SHEARED AND A COUNTER BALANCE WEIGHT FLEW OFF THE TURBINE WHILE TESTING IN FLIGHT. THE FLIGHT CREW DID NOT NOTICE THE FAILURE. UPON RETURN, AN INSP PRIOR STOWAGE OF TURBINE REVEALED THE MISSING WEIGHT. AFTER THAT FACT, AN INSP WAS CARRIED OUT ON THE REMAINDER OF THE SITES ACFT WITH NO FURTHER WEIGHTS MISSING. THE INCIDENT WAS DEEMED ISOLATED, THE TUBINE REPLACED AND THE ACFT RETURNED TO SERVICE WITHOUT FURTHER INCIDENT. (TC 20100121009)