Casualties unknown

Simulated Engine Failure Leads to Forced Landing and Nose-Over (N6231K)

Steamboat Sprin, CO, US

On April 22, 1991, a Cessna 172 (registration N6231K) operated by Steamboat Flying Service was involved in an aviation accident near Steamboat Sprin, CO. Investigators recorded the probable cause as: THE CFI USED POOR JUDGEMENT IN GIVING A SIMULATED ENGINE FAILURE BY TURNING OFF THE FUEL SELECTOR VALVE. 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

During a pre-solo instructional flight, an instructor simulated an engine failure by turning off the fuel selector valve. When reactivated, the engine failed to restart promptly, resulting in a forced landing in a field. Soft terrain caused the nose wheel to dig in, flipping the aircraft onto its back.

Incident Overview

A pre-solo instructional flight encountered an unexpected situation when the flight instructor simulated an engine failure while the aircraft was in the airport traffic pattern. The instructor turned off the fuel selector valve to create the scenario. After the simulation, when the valve was turned back on, the engine did not restart in a timely manner. This led to a forced landing in a field.

Forced Landing

The aircraft was maneuvered for a landing in a field due to the engine not restarting. The terrain in the field was described as soft. During the landing roll, the nose wheel encountered the soft ground and dug in.

Outcome

As a result of the nose wheel digging into the soft terrain, the aircraft flipped onto its back. The aircraft came to rest in an inverted position.

Background

The flight was part of pre-solo instruction, with a student pilot under the guidance of a flight instructor. The simulated engine failure was conducted within the airport traffic pattern. The instructor used the fuel selector valve to simulate the failure.

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Frequently asked questions

What happened in the 22 Apr 1991 Cessna 172 accident near Steamboat Sprin, CO?

During a pre-solo instructional flight, an instructor simulated an engine failure by turning off the fuel selector valve. When reactivated, the engine failed to restart promptly, resulting in a forced landing in a field. Soft terrain caused the nose wheel to dig in, flipping the aircraft onto its back.

What aircraft was involved and where did it happen?

The accident on 22 Apr 1991 involved a Cessna 172, registration N6231K, operated by Steamboat Flying Service, at Steamboat Sprin, CO.

What was the probable cause of the accident?

THE CFI USED POOR JUDGEMENT IN GIVING A SIMULATED ENGINE FAILURE BY TURNING OFF THE FUEL SELECTOR VALVE.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X16778. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.