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3 fatalities

Pacific Ocean Crash of a Delivery Flight from Long Beach (HS-OOO)

Pacific Ocean, WorldFlight

On July 25, 1966, a Douglas DC-3 (registration HS-OOO) operated by Thai Government was involved in an aviation accident near Pacific Ocean, World in flight. 3 people were killed. Investigators recorded the probable cause as: engine failure. This summary draws on records from the Bureau of Aircraft Accidents Archives (B3A).

Sourcesthe Bureau of Aircraft Accidents Archives (B3A)Primary reportUpdated 2026-06-12Data APIEditorial standards

An airplane on a delivery flight from Long Beach to Bangkok via Honolulu crashed into the Pacific Ocean after an engine failure. The aircraft and its three occupants were never found.

Incident Overview and Flight Details The aircraft departed Long Beach Airport on a delivery flight intended for Bangkok, with a planned stopover in Honolulu. During the cruise phase, the flight was approximately 525 miles from the California coast when the crew reported an engine failure to air traffic control. Following this report, the crew elected to return to the departure area. ## Loss of Contact and Search Outcome After the crew's decision to return, contact with the aircraft was lost. The airplane subsequently crashed into the Pacific Ocean. Despite the incident, no trace of the aircraft or its three occupants was ever recovered or found. ## Official Findings The official investigation identified the probable cause of the accident as an engine failure.

Engine failure

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