Incident Overview
On June 29, 2016, a Piper Arrow PA-28R aircraft was involved in an incident at Częstochowa-Rudniki airport (EPRU). During the flight, the pilot-instructor observed a decrease in engine power and decided to perform a precautionary landing at the airport. Operations with the aircraft were suspended for the day.
Post-Incident Inspection
The following day, a mechanic from the maintenance organization conducted an inspection of the aircraft. The examination revealed white marks on the exhaust pipe and on the lower part of the airframe. According to the mechanic, these marks could indicate an excessively lean fuel-air mixture. A subsequent engine test was performed, and the engine operated normally. The aircraft was subsequently returned to service.
Probable Cause
The investigation determined that the probable cause of the incident was an overly lean fuel-air mixture.
Safety Recommendations
No safety recommendations were issued by the investigating body. No preventive actions were taken by the entity conducting the investigation.