What happened
On May 1, 2019, a medical mission was underway involving a branch of the Polish Medical Air Rescue (LPR) based in Sokołów Podlaski. After completing a flight to Wólka Dolna to transport a patient, the crew prepared for a subsequent flight to the Provincial Hospital in Siedlce.
While the engines were running at idle, the Crew Alerting Display (CAD) issued an XMSN CHIP warning, indicating the detection of metal particles within the main gearbox. In response to this warning, the pilot decided to abort the mission, shut down the engines, and grounded the aircraft at the location of the incident. Following consultation with the Technical Coordination Center, the helicopter was prohibited from further flight until a technical inspection could be performed.
The investigation
Technical personnel inspected the aircraft and identified a