Incident Overview
On 30 October 2014, a Piper PA-28R aircraft (registration not specified) was conducting a training flight at Warsaw-Modlin Airport (EPMO). The flight was a type conversion course involving a pilot-instructor and a student pilot. The plan included airport traffic pattern circuits and an area flight.
Description of the Event
During the initial climb after takeoff, the pilot-instructor noticed abnormal engine behavior. The engine exhibited uneven operation, with rpm drops of 50 to 100 revolutions per minute lasting 2 to 3 seconds. The instructor decided to land as soon as possible and requested priority from the air traffic controller, citing the rough engine. The controller granted priority and inquired whether assistance was needed on landing. The instructor declined assistance, as the landing was intended solely to verify the engine's technical condition.
The landing was conducted without further incident. The aircraft taxied to the hangar.
Post-Flight Inspection
Two mechanics holding Part-145 licenses performed ground tests on the aircraft and engine. No further irregularities were found. The cause of the uneven engine operation during the flight was not identified despite the inspection.
Investigation Outcome
The investigation was overseen by Jacek Jaworski and conducted by the operator's commission. No safety recommendations were issued, as the cause of the engine irregularity remained unidentified.