Event Overview
An airplane that had just undergone major engine work was released for an engine ground test run, not for flight. Approximately one minute after takeoff, the pilot reported a need to return and was cleared for right traffic to runway 33. About two minutes later, the pilot requested to turn base leg. Shortly thereafter, the airplane was observed to roll over and impact the ground in an inverted attitude.
Component Failure
Examination revealed that the left elevator horizontal tube, which extends outboard from the bellcrank, had failed. Corrosion particles were found inside the tube. The tube thickness outboard of the corroded area measured 0.035 inch.
Maintenance Context
The director of maintenance stated that the airplane was due for its annual inspection, which had been scheduled prior to releasing the airplane for flight testing.