Mountain Crash West of Wada, Nagano (JA5273)

Incident Overview and Location Details During an en route flight, the aircraft experienced a failure of its right engine. The incident occurred in the prefecture of Nagano, specifically on the slope of a mountain situated west of the town of Wada. The crash resulted in the total destruction of the aircraft and the deaths of all three people on board. The source does not specify the aircraft type, registration, operator, or the exact date of the accident. ## Operational Sequence and Mechanical Failure The pilot attempted to manage the engine failure but was unable to feather the propeller. This mechanical limitation caused the aircraft to lose altitude continuously until it impacted the mountain slope. The official investigation identified the probable cause as the failure of the right engine, which was triggered by the in-flight breakage of the piston head in the second cylinder.