Accident to the Tecnam P92 - JS registered F-HBSV on 10/11/2019 at Chambéry Challes-les-Eaux (Savoie)

Cat. 2 investigation report: simplified-format report, adapted to the circumstances of the occurrence and the investigation stakes.

During the missed approach, in initial climb, the instructor noticed a reduction in engine power and the appearance of vibrations. She took over the control and noticed that the residual power delivered by the engine, after adjustment to eliminate the vibrations, did not enable her to maintain level flight. In the absence of an area suitable for an emergency landing straight ahead, she decided to turn back to land at the aerodrome. She converged towards the paved runway and landed approximately 100 m before the end of the runway. When running over the grass beyond the runway, passing over a rut, the nose gear failed and the plane came to a stop.
The origin of the reduction in power of the engine could not be determined with certainty.
Nevertheless, it is likely that the air duct supplying the carburettors with hot air was damaged before the flight and contributed to rendering the carburettor heat device less effective. This loss of effectiveness, taking into account the meteorological conditions at the time of the occurrence, may have favoured the appearance of the carburettor icing phenomenon and caused the reduction in power.