Casualties unknown

Aircraft Strikes Trees After Encountering Downdraft in Steep Canyon (N61918)

Elkhorn, MT, US

On March 18, 1990, a Cessna 172 (registration N61918) operated by Helena Aircraft Inc. was involved in an aviation accident near Elkhorn, MT. Investigators recorded the probable cause as: THE PILOT'S DECISION TO ATTEMPT FLIGHT IN TERRAIN AND CONDITIONS WHICH EXCEEDED THE PERFORMANCE CAPABILITIES OF THE AIRPLANE. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive; 1 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 pilot reported flying low and slow up a steep canyon when a strong downdraft prevented altitude maintenance. The aircraft nosed down into trees, coming to rest 8 feet off the ground with damage to the right wing, fuselage, and propeller.

Incident Overview

The pilot of an aircraft reported that the flight proceeded at low altitude and slow speed up a steep canyon. According to the pilot, the aircraft encountered a strong downdraft and, despite applying full power, could not maintain altitude. The canyon walls rose steeply and narrowed rapidly, making it impossible to turn around and exit the canyon.

Sequence of Events

The aircraft subsequently nosed down into trees, becoming wedged against a tree trunk. It came to rest approximately 8 feet off the ground in a nose-down attitude. The pilot noted that the right wing, fuselage, and propeller sustained bending damage.

Pilot Commentary

The pilot stated that he should have selected a higher altitude and avoided flying up the canyon. No further details regarding aircraft type, registration, or occupant status were provided in the initial report.

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Frequently asked questions

What happened in the 18 Mar 1990 Cessna 172 accident near Elkhorn, MT?

A pilot reported flying low and slow up a steep canyon when a strong downdraft prevented altitude maintenance. The aircraft nosed down into trees, coming to rest 8 feet off the ground with damage to the right wing, fuselage, and propeller.

What aircraft was involved and where did it happen?

The accident on 18 Mar 1990 involved a Cessna 172, registration N61918, operated by Helena Aircraft Inc., at Elkhorn, MT.

What was the probable cause of the accident?

THE PILOT'S DECISION TO ATTEMPT FLIGHT IN TERRAIN AND CONDITIONS WHICH EXCEEDED THE PERFORMANCE CAPABILITIES OF THE AIRPLANE.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X22702. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.