After 69 years this accident is still a mystery.

This accident happened Apr 9, 1952.
The airspace over Japan was under control of US Occupation Army.
The plane operated by veteran American plots flew into Oshima Island Volcano Mt. Mihara (about 2,500') after taking off from Tokyo.
The control asked the flight to fly at 2,000' feet for 10 unites. It was retracted by the fact the plane reach Mt. Mihara in 7 minutes.
The conversation between crew and the control has not been released after 69 years.

Government always have a tendency to hide anything that may cause reputation damage. People make mistake. Tha is okay if you learn from it. You cannot learn if you hide the truth.

Circumstances:

En route from Tokyo to Osaka, while cruising about 100 km south of Tokyo in marginal weather conditions, the airplane christened 'Mokusei' (Jupiter) hit the slope of the Mt Mihara (volcano) located on the Oshima Island. The wreckage was found few hours later and all 37 occupants have been killed. Apparently, the airplane was off course at the time of the accident, most probably due to a navigational error on part of the crew.

Probable cause:

Although the Japanese government aircraft accident investigation committee conducted a thorough investigation, it encountered some difficulty because of the rejection by the Occupation authorities of a request from the committee to provide a tape recording of instructions to the distressed aircraft from the Haneda Airport control tower. As a result, the accident investigation was closed with the aviation agency's report that the probable cause was the pilot's operational error.

https://www.baaa-acro.com/crash/crash-martin-202-mt-mihara-37-killed

Kenichi Uchikura
President / CEO
Pacific Software Publishing, Inc.
ken.uchikura＠pspinc.com

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