Casualties unknown

Helicopter Collides with Terrain on Ferry Flight from Kona to Hilo (N98AW)

Hilo, HI, US

On May 18, 1997, a Bell 206B (registration N98AW) operated by Tetsuro E. Sugiyama was involved in an aviation accident near Hilo, HI. Investigators recorded the probable cause as: the noninstrument-rated pilot flew into instrument conditions and failed to maintain adequate terrain clearance, while attempting to descend through an overcast. The adverse weather conditions and mountainous terrain were related factors. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive; 8 related events involving the same aircraft type or operator are linked below.

Sourcesthe U.S. National Transportation Safety Board (NTSB) historical archivePrimary reportUpdated 2026-06-10Data APIEditorial standards

A noninstrument-rated pilot flying a helicopter on a ferry flight from Kona to Hilo, without a preflight weather briefing, collided with mountainous terrain at 6,500 feet in variable meteorological conditions.

Incident Overview

A helicopter on a company visual flight plan for a ferry flight from Kona to Hilo, Hawaii, collided with mountainous terrain at an elevation of 6,500 feet. The pilot, who was not instrument-rated, had not obtained a preflight weather briefing before departure.

Meteorological Conditions

Meteorological conditions along the intended route of flight were variable, ranging from visual to instrument conditions. A 7,000-foot overcast layer covered the destination, Hilo, and the eastern portion of the route. A first officer and captain for Hawaiian Airlines, who were flying in the area, reported observing the helicopter 15 to 20 miles west of Hilo on top of an overcast. They noted that the pilot appeared to be searching for a visual path through the clouds. According to the first officer, at that time, there were no visible holes in the clouds, and Hilo was under a solid overcast.

Collision

The helicopter subsequently collided with mountainous terrain at 6,500 feet. The source does not specify the extent of damage or any injuries.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001208X07954. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.