Overview
On 29 May 2016, a Cessna 152 operating at Warsaw-Modlin Airport (EPMO) experienced an incident shortly after departure. The pilot reported fluctuations in engine RPM and initiated a straight-in landing back at the departure airport. The aircraft landed without further issues.
Incident Details
After takeoff from runway DS08, the pilot observed abnormal RPM indications. Deciding to return immediately, the pilot performed a straight-in approach and landed without incident. Following the landing, operations with the aircraft were suspended pending a mechanic's inspection.
Investigation Findings
The mechanic examined the aircraft and found evidence of spark plug fouling. The spark plugs were cleaned, and three successive engine run-ups were conducted. No anomalies were detected during the tests, and the aircraft was returned to service.
The investigation determined that the cause of the RPM fluctuation was contamination of the spark plugs. No other contributing factors were identified. The relevant aviation authority did not issue any safety recommendations or preventive actions.
Conclusion
The incident was attributed solely to spark plug fouling, which was resolved by cleaning. The aircraft resumed normal operations after verification of engine performance.