Casualties unknown

Helicopter Rolls Over After Touchdown in Blowing Snow During Ski Transport Flight (N49573)

Winthrop, WA, US

On February 4, 1990, a Bell 206B (registration N49573) was involved in an aviation accident near Winthrop, WA. Investigators recorded the probable cause as: WATER CONTAMINATION OF THE FUEL AND THE PILOT'S INADEQUATE PREFLIGHT OF THE AIRCRAFT. DARKNESS AND THE OBSTRUCTIONS IN THE EMERGENCY LANDING AREA 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 2026-07-04Data APIEditorial standards

A helicopter transporting skiers rolled over after touching down left skid first during a landing in reduced visibility due to blowing snow. The pilot lost reference point near touchdown.

Incident Overview

During a local flight to transport skiers to a mountain, the pilot initiated a descent for landing. When the helicopter was approximately 30 feet above ground level (AGL), the descent was terminated due to a loss of visibility caused by blowing snow. After the snow settled, the pilot continued the descent.

Sequence of Events

Just prior to touchdown, visibility again decreased, and the pilot lost his reference point. The helicopter touched down with the left skid first and immediately rolled over.

Contributing Factors

The accident report did not specify any contributing factors beyond the described sequence of events.

All Bell 206 accidents →

Frequently asked questions

What happened in the 4 Feb 1990 Bell 206B accident near Winthrop, WA?

A helicopter transporting skiers rolled over after touching down left skid first during a landing in reduced visibility due to blowing snow. The pilot lost reference point near touchdown.

What aircraft was involved and where did it happen?

The accident on 4 Feb 1990 involved a Bell 206B, registration N49573, at Winthrop, WA.

What was the probable cause of the accident?

WATER CONTAMINATION OF THE FUEL AND THE PILOT'S INADEQUATE PREFLIGHT OF THE AIRCRAFT. DARKNESS AND THE OBSTRUCTIONS IN THE EMERGENCY LANDING AREA WERE RELATED FACTORS.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X22634. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.