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Toa Domestic Airlines Flight 63
Japan Domestic Airlines YS-11 JA8764.jpg
JA8764, the aircraft involved in the accident
DateJuly 3, 1971
SummaryPilot error leading to CFIT
SiteYokotsudake, Hokkaido, Japan
41°56′00″N 140°47′00″E / 41.93333°N 140.7833°E / 41.93333; 140.7833 (Yokotsudake)
Aircraft typeNAMC YS-11A-217
OperatorToa Domestic Airlines
Flight originOkadama Airport
DestinationHakodate Airport

Toa Domestic Airlines Flight 63, registration JA8764, was a NAMC YS-11A-217 en route from Okadama Airport in Sapporo, Japan to Hakodate Airport. On July 3, 1971, the plane left Sapporo Okadama Airport on a scheduled flight at 08:30. After arriving in Hakodate airspace, the plane was descending below 1800 metres when it crashed at 09:05 into the south face of Yokotsudake (Yokotsu Mountain). All 64 passengers and four crew on board are killed in the scene. The cause of the crash was determined to be pilot error that followed strong winds pushing the plane off course which leads to CFIT.

The Aircraft Accident Investigation Commission (AAIC) was formed soon after the crash.[1]


  1. ^ Yasuo Sato "Activities of Japan's Aircraft and Railway Accidents Investigation Commission" Japan Railway & Transport Review No. 33