Casualties unknown

Whirlwind Causes Substantial Damage to Aircraft on Final Approach (N35485)

Isabel, SD, US

On March 11, 1990, a Cessna 172I (registration N35485) was involved in an aviation accident near Isabel, SD. Investigators recorded the probable cause as: Encounter with a whirlwind during final approach, which resulted in severe turbulence and a hard landing causing substantial damage to the aircraft. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.

Sourcesthe U.S. National Transportation Safety Board (NTSB) historical archivePrimary reportUpdated 2026-06-22Data APIEditorial standards

A private pilot experienced severe turbulence from a whirlwind while landing at a ranch airstrip, resulting in substantial damage to the aircraft's wing and landing gear.

What happened

The pilot was conducting a final approach to his personal ranch airstrip when he encountered a whirlwind. The atmospheric conditions generated severe turbulence that significantly affected the aircraft's stability during the landing phase. Upon touchdown, the aircraft landed hard due to the turbulent air mass.

The impact caused substantial damage to the aircraft structure and systems. The landing gear was damaged upon impact with the ground. Additionally, the propeller sustained damage from the force of the hard landing. Most critically, the left wing tore loose at its root attachment point.

Initially, the pilot reported that the damage was minor. However, after a more thorough assessment, he updated his report to the Federal Aviation Administration (FAA), classifying the damage as substantial.

Probable cause

Encounter with a whirlwind during final approach, which resulted in severe turbulence and a hard landing causing substantial damage to the aircraft.

Frequently asked questions

What happened in the 11 Mar 1990 Cessna 172I accident near Isabel, SD?

A private pilot experienced severe turbulence from a whirlwind while landing at a ranch airstrip, resulting in substantial damage to the aircraft's wing and landing gear.

What aircraft was involved and where did it happen?

The accident on 11 Mar 1990 involved a Cessna 172I, registration N35485, at Isabel, SD.

What was the probable cause of the accident?

Encounter with a whirlwind during final approach, which resulted in severe turbulence and a hard landing causing substantial damage to the aircraft.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X22709. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.