Eurocopter AS-350-BA N594BK

Summary

On 25 June 1998 at about 19:32 local time, a Eurocopter AS-350-BA registered N594BK was involved in an accident near Mt. Waialeale, Hawaii, United States. 6 people were on board and 6 died. The aircraft was destroyed. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

25 June 1998 at 19:32

Classification

Accident

Location

Mt. Waialeale, Hawaii, United States

Coordinates

21.9707, -159.3499

Aircraft

Eurocopter AS-350-BA

Registration

N594BK

Category

Helicopter

Engines

1

Operator

Not recorded

Operating rule

Part 135: Air Taxi & Commuter

Purpose of flight

Unknown

Phase of flight

Not recorded

Route

Lihue → Unknown

Aircraft damage

Destroyed

Weather

IMC

Light

Day

NTSB number

LAX98FA211

6 people died.

The pilot's decision to continue VFR flight into deteriorating weather conditions consisting of lowering ceilings and visibility in mountainous terrain, which resulted in the inadvertent entry into instrument meteorological conditions and a collision with a mountain side. A factor in the accident was the failure of the chief pilot, who had directly observed the deteriorating weather conditions, to direct the following pilots to avoid the area.

Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.

Read the full NTSB narrative

While operating under visual flight rules on an on-demand for hire aerial sight seeing tour, the helicopter encountered instrument meteorological conditions and impacted the 80-degree upsloping face of a mountain, 200 feet below its ridge crest. The tour was to circumnavigate a mountainous area on the island, with a visit to an extinct volcanic crater in a mountain valley. Three helicopters departed on the tour, with about 2 minutes between each departure. The pilot, who was employed by the operator 2.5-months earlier, was in trail behind the company's most experienced (chief) pilot, and second most experienced pilot. None had received a weather briefing from an FAA approved source as required in the company operations specifications. Throughout the flight they were in radio contact with each other. The two lead pilots were a few minutes ahead of the accident pilot as he approached an area of the valley near the crater where inclement weather existed. The second pilot ahead of the accident helicopter said that when he exited the crater near the accident site, he encountered heavy rain showers and lowering ceilings and visibilities. Although the accident pilot attempted to follow the company pilots ahead of him, he did not observe the valley entrance to the Waialeale crater viewpoint and flew past it. As the flight progressed, the pilot encountered lowering ceilings, heavy intensity rain showers, and reduced flight visibility. The pilot became disoriented, misjudged his location, and while cruising toward what he believed was the prescribed crater entranceway inadvertently entered instrument meteorological conditions. Just before the collision, the pilot transmitted to the pilots ahead of him that the weather was getting worse and that he could not see. The second pilot then provided a suggested heading that would take the accident pilot away from the mountainous terrain. The helicopter impacted the mountain on a heading nearly opposite of the one suggested. The helicopter was subsequently recovered and examined. No evidence of any preimpact mechanical malfunction was noted. Between 30 and 45 minutes after the accident, one of the operator's tour pilots reported receiving the signal of an emergency locator transmitter (ELT). This pilot proceeded to pass by the general accident site area but was unable to observe the crashed helicopter due to the low level of clouds.

Quoted verbatim from the NTSB record.