The helicopter had settled into a cruise climb shortly after takeoff when the engine rpm started to increase and to hunt. The pilot switched off the governor to control the speed manually and initiated a precautionary landing. However, he believes the engine then failed and, during the subsequent autorotative landing, the helicopter rolled onto its side. At the time of writing, there is no hard evidence of an engine or governor fault but it was noted that the weather conditions were consistent with a risk of serious carburettor icing at any power.
Robinson R44 Raven, G-CEDG 05-15