Incident Overview
On 9 June 2012, at Poznań-Ławica Airport (EPPO), a Cirrus SR22 aircraft experienced an incident during takeoff. The pilot, a professional pilot with a CPL(A) and factory authorization on the type, had accumulated 1,700 total flight hours, including over 1,200 hours on the SR22. The flight was planned with a new example of the aircraft.
During the takeoff roll, immediately after rotation, the pilot detected a slight, uncharacteristic vibration originating from the forward part of the aircraft. Unable to identify the cause, he decided to abort the takeoff and land on the remaining runway. The landing was executed without hazard to the crew or the aircraft. The pilot informed the Poznań-Ławica Tower (TWR EPPO) about the rejected takeoff and the need for engine re-check.
After taxiing to the threshold of Runway 28, the pilot conducted a repeat engine run-up, which included several cycles of maximum RPM—a procedure not part of the standard checklist. The engine appeared to operate normally, so the pilot decided to attempt another takeoff. The subsequent flight proceeded without further issues.
Investigation Findings
Later, the engine monitor data was analyzed and showed no deviations from normal parameters. Similar light, uncharacteristic vibrations were reported on several other takeoffs but never during stabilized flight. The aircraft was subjected to additional maintenance checks at a service station. The investigation determined that the cause was an adjustment of the nose wheel bearing. After takeoff, the nose wheel continued to rotate, and depending on the rotation speed at liftoff, it transmitted perceptible vibrations to the aircraft structure. The pilot's actions were assessed as correct.
Probable Cause
The adjustment of the nose wheel bearing, which continued to rotate after takeoff and transmitted felt vibrations to the aircraft structure.
Preventive Actions
The operator informed pilots flying this type about the incident and its causes.