12 fatalities

Fatal aircraft accident during maritime survey in Okinawa Archipelago (4628)

Amami (Amami-Ōshima Island), Japan

On September 3, 1962, a Lockheed P-2 Neptune (registration 4628) operated by Japan Maritime Self-Defense Force - Kaijō Jieitai was involved in an aviation accident near Amami (Amami-Ōshima Island), Japan. 12 people were killed. Investigators recorded the probable cause as: The aircraft struck a mountain slope while flying in marginal weather conditions during a maritime survey mission. 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

A maritime survey flight ended in a fatal crash on Mount Rankan after the crew encountered poor weather conditions.

What happened

During a scheduled maritime survey mission throughout the Okinawa Archipelago, an aircraft crashed into the terrain. While performing its operational duties, the plane encountered marginal weather conditions that complicated the flight. During this period of degraded visibility or difficult flying conditions, the aircraft struck the slope of Mt Rankan.

The impact resulted in a total of 12 fatalities, with no survivors reported among the crew members on board. The accident occurred during the operational phase of the survey mission while navigating the mountainous region.

Findings

  • The flight was operating under marginal weather conditions at the time of the accident.
  • The aircraft made contact with the slope of Mt Rankan, leading to the destruction of the plane and the loss of all occupants.

Probable cause

The aircraft struck a mountain slope while flying in marginal weather conditions during a maritime survey mission.