11 fatalities

Fatal maritime patrol aircraft crash at sea (4614)

Chōshi, JapanFlight

On July 17, 1965, a Lockheed P-2 Neptune (registration 4614) operated by Japan Maritime Self-Defense Force - Kaijō Jieitai was involved in an aviation accident near Chōshi, Japan in flight. 11 people were killed. 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 2026-06-12Data APIEditorial standards

An aircraft conducting a maritime patrol mission crashed into the ocean, resulting in the deaths of all personnel on board.

What happened

During a scheduled maritime patrol operation along the coastline, an aircraft lost control while in the cruise phase of flight. The plane subsequently impacted the surface of the sea. The crash occurred under circumstances that remain unidentified at this time.

All 11 crew members on board the aircraft perished in the accident. There were no survivors reported from the wreckage.

Findings

The specific reasons for the loss of control and the subsequent impact with the water have not yet been determined. Investigators have not released details regarding the exact cause of the flight deviation or the crash.