Incident Overview
On 29 December 2016, a Tecnam P2006T aircraft operated by Ventum Air was conducting circuit training flights at EPBC aerodrome. The flight crew consisted of a student pilot undergoing CPL(A) training and an instructor.
Sequence of Events
During the first circuit, the crew noticed slight vibrations from the right engine. The vibrations ceased when carburetor heat was applied during the descent. The crew attributed the issue to high humidity and decided to continue flying.
In the second circuit, after configuring the aircraft for landing (including activating carburetor heat), the engine roughness persisted. After the third turn, the engine's running became uneven enough that the instructor took control. Following the fourth turn, the instructor shut down the right engine, and the propeller feathered. The aircraft landed without further incident using only the left engine.
Post-Flight Findings
Subsequent examination by maintenance personnel revealed a damaged gear in the propeller governor drive mechanism on the right engine.
Investigation Results
The investigation was conducted by the operator under the supervision of the Polish State Commission on Aircraft Accident Investigation. The cause of the incident could not be determined. A contributing circumstance was the intensive use of the aircraft in training operations. No safety recommendations were issued.