5 fatalities

Training Flight Crashes into House After Engine Failure; Five Crew Members Killed (22011)

Utsunomiya, JapanFlight

On August 10, 1981, a Mitsubishi MU-2 Marquise (registration 22011) operated by Japan Air Self-Defense Force - Kōkū Jieitai was involved in an aviation accident near Utsunomiya, Japan in flight. 5 people were killed. Investigators recorded the probable cause as: Engine failure for unknown reasons. This summary draws on records from the Bureau of Aircraft Accidents Archives (B3A); 8 related events involving the same aircraft type or operator are linked below.

Sourcesthe Bureau of Aircraft Accidents Archives (B3A)Primary reportUpdated 2026-06-11Data APIEditorial standards

A twin-engine training aircraft with six crew members experienced an engine failure, lost control, and crashed into a house. One crew member was seriously injured and five were killed. No ground casualties.

Incident

The incident involved a twin-engine airplane engaged in a training flight. The aircraft was carrying a total of six crew members. During the flight, the crew communicated with air traffic control and reported that they were experiencing an engine failure. Subsequent to this report, the crew lost control of the airplane, causing it to enter a dive. The dive continued until the aircraft crashed into a house. The crash had severe consequences: one crew member was seriously injured, and the other five crew members sustained fatal injuries. There were no casualties on the ground.

Official Findings

An official investigation was conducted to determine the cause of the accident. The investigators found that the accident was caused by an engine failure. However, they were unable to determine the specific reason for the failure. The probable cause was thus listed as an engine failure for unknown reasons. No other factors were cited as contributing to the accident.