Accident
On a flight from Tokyo to Osaka, an aircraft named 'Mokusei' (Jupiter) was cruising approximately 100 kilometers south of Tokyo in marginal weather conditions when it collided with the slope of Mount Mihara, a volcano on Oshima Island. The wreckage was located a few hours later. All 37 occupants were killed.
Investigation
The Japanese government aircraft accident investigation committee conducted a thorough investigation. However, the committee faced difficulties after the Occupation authorities rejected a request to provide a tape recording of instructions given to the distressed aircraft from the Haneda Airport control tower. As a result, the investigation was closed.
The aviation agency's report stated that the probable cause of the accident was the pilot's operational error. The aircraft was apparently off course at the time of the accident, most likely due to a navigational error by the crew.