Casualties unknown

1991-02-25: Cessna 421C (N125KS) — Kansas State University — Fort Morgan, CO

Fort Morgan, CO, US

On February 25, 1991, a Cessna 421C (registration N125KS) operated by Kansas State University was involved in an aviation accident near Fort Morgan, CO. Investigators recorded the probable cause as: The copilot's windshield failed during cruise flight, causing rapid decompression. The cause of the failure could not be determined as the windshield was properly installed and no other contributing factors were identified. 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 1781061362Data APIEditorial standards

During cruise flight at flight level 190, the copilot's windshield failed causing rapid decompression. The captain declared an emergency and landed the aircraft without incident.

What happened

The accident occurred during cruise flight at flight level 190. While en route, the copilot's windshield experienced a catastrophic failure. This event triggered a rapid decompression of the cabin.

Despite the sudden loss of pressure and the structural failure of the cockpit window, the captain maintained control of the aircraft. The captain declared an emergency with air traffic control and proceeded to land the aircraft safely. There were no reported injuries or further damage to the airframe during the landing phase.

The investigation

Following the incident, investigators collected and analyzed portions of the remaining windshield structure. The examination focused on determining whether manufacturing defects, installation errors, or material fatigue contributed to the failure.

The technical review confirmed that the windshield was properly installed according to manufacturer specifications. No evidence of improper mounting or pre-existing structural flaws was found in the retained components. Investigators were unable to identify a specific mechanical reason for the failure based on the physical evidence available.

Probable cause

The copilot's windshield failed during cruise flight, causing rapid decompression. The cause of the failure could not be determined as the windshield was properly installed and no other contributing factors were identified.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X16439. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.