Casualties unknown

1990-11-08: Aerospatiale SA315B LAMA (N36012) — Rocky Mountain Helicopters — Trout Lake, WA

Trout Lake, WA, US

On November 8, 1990, an Aerospatiale SA315B LAMA (registration N36012) operated by Rocky Mountain Helicopters was involved in an aviation accident near Trout Lake, WA. Investigators recorded the probable cause as: THE PILOT'S FAILURE TO MAINTAIN CLEARANCE FROM AN OBSTACLE. 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 1781061362Data APIEditorial standards

During an external load operation, a helicopter drifted after releasing a load of logs, causing the long line to become entangled in trees. The pilot released the line but lost control, resulting in collision with trees and terrain.

Accident Sequence

The accident occurred during an external load operation. The pilot had just released a load of logs when the helicopter began to drift to one side. This drift caused the long line, which was still attached to the helicopter and had been used for the external load, to become entangled in nearby trees. Realizing the entanglement, the pilot released the long line from the helicopter. However, despite releasing the line, the pilot was unable to maintain control of the aircraft. The helicopter subsequently collided with trees and the terrain.

Pilot Report

After the accident, the pilot reported that there were no mechanical failures or malfunctions with the helicopter at the time of the accident. The pilot's statement indicates that the loss of control and subsequent collision occurred without any identified technical issues with the aircraft.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X24700. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.