Incident Overview
Date: Saturday 3 July 1971
Aircraft Type: NAMC YS-11A-217
Owner/operator: TOA Domestic Airlines
Registration Number: JA8764
Location: Yokotsu Mt –
ÿ Japan
Phase of Flight: En route
Status: Destroyed, written off
Casualties: Fatalities: 68 / Occupants: 68
Component Affected: Aircraft control systems (navigation, altitude, descent)Aircraft control systems (navigation, altitude, descent)
Category: Accident
A NAMC YS-11A passenger plane, JA8764, crashed on Yokotsudake Mountain, Japan, resulting in the deaths of all 64 passengers and 4 crew members. The aircraft was attempting to cross a high station and subsequently drifted northward due to a strong southwesterly wind, striking a mountain.A NAMC YS-11A passenger plane, JA8764, crashed on Yokotsudake Mountain, Japan, resulting in the deaths of all 64 passengers and 4 crew members. The aircraft was attempting to cross a high station and subsequently drifted northward due to a strong southwesterly wind, striking a mountain.
Description
A NAMC YS-11A passenger plane, JA8764, was destroyed in an accident on Yokotsudake Mountain, Japan. All 64 passengers and 4 crew members were killed. TOA Domestic flight 63 originated in Sapporo and was approaching Hakodate Airport (HKD) at the time of the crash. The flight crew mistook a point approximately 5 nautical miles north of the Hakodate NDB as being just over the Hakodate NDB, a navigation aid, and initiated their descent from an estimated altitude of 6,000 ft in an attempt to cross the high station at 2,500 ft by making a single circle. The outbound flight leg was extended westward and because of a strong southwesterly wind, the aircraft drifted further to the north than the crew expected, striking the mountain.
Source of Information
http://www.jal.com/en/flight/safety/center/accident.htmlhttp://www.jal.com/en/flight/safety/center/accident.htmlPrimary Cause
Pilot error due to incorrect navigation and altitude setting during descent.Pilot error due to incorrect navigation and altitude setting during descent.Share on:
