11 fatalities

Twin-Engine Aircraft Mountain Strike Near Hilo (N28358)

Hilo, United States of AmericaFlight

On April 11, 1974, a Beechcraft H18 (registration N28358) operated by Island Air USA was involved in an aviation accident near Hilo, United States of America in flight. 11 people were killed. Investigators recorded the probable cause as: The pilot was flying under VFR mode in adverse weather conditions. High obstructions and a low ceiling were considered as contributing factors. 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

A twin-engine aircraft struck a mountain slope northwest of Hilo in poor weather, killing all 11 occupants. The official investigation cited VFR flight in adverse weather, high obstructions, and a low ceiling as contributing factors.

Incident Overview A twin-engine aircraft encountered poor weather conditions while operating in the area northwest of Hilo. During the flight, the aircraft struck the slope of a mountain. The wreckage was located the following day, and all 11 people on board were killed. ## Official Findings The investigation determined that the pilot was operating under visual flight rules (VFR) in adverse weather conditions. The official findings identified high obstructions and a low ceiling as contributing factors to the accident. No aircraft type, registration, operator, or specific date was provided in the source material.

Probable cause

The pilot was flying under VFR mode in adverse weather conditions. High obstructions and a low ceiling were considered as contributing factors.