Casualties unknown

Right Main Landing Gear Ski Detaches During Off-Airport Landing on Snow-Covered Lake (N9850X)

Trinity Lake, AK, US

On April 12, 1989, a Cessna 185 (registration N9850X) was involved in an aviation accident near Trinity Lake, AK. Investigators recorded the probable cause as: Failure of the ski attachment bolts due to heavy snow conditions. 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 2026-07-04Data APIEditorial standards

During a late afternoon landing on a snow-covered lake, the right main landing gear ski detached after touchdown, causing the gear leg to penetrate snow and ice, collapsing the gear.

Accident Summary

A pilot attempted a late afternoon landing at an off-airport site on a snow-covered lake. Shortly after touchdown, the right main landing gear ski became detached from the gear leg. The gear leg then penetrated the snow and struck the underlying ice, causing the right main landing gear to collapse.

Pilot Report

The pilot reported that the snow conditions were extremely wet. During the landing roll, the right main ski became mired in the heavy snow, which ultimately caused the ski attachment bolts to fail. This allowed the gear leg to strike the ice, leading to the collapse of the gear.

No further information is available regarding the aircraft type, registration, date, operator, location, or occupants. No injuries were reported.

Probable cause

Failure of the ski attachment bolts due to heavy snow conditions.

Frequently asked questions

What happened in the 12 Apr 1989 Cessna 185 accident near Trinity Lake, AK?

During a late afternoon landing on a snow-covered lake, the right main landing gear ski detached after touchdown, causing the gear leg to penetrate snow and ice, collapsing the gear.

What aircraft was involved and where did it happen?

The accident on 12 Apr 1989 involved a Cessna 185, registration N9850X, at Trinity Lake, AK.

What was the probable cause of the accident?

Failure of the ski attachment bolts due to heavy snow conditions.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001213X28014. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.