Casualties unknown

Loss of Engine Power Leads to Forced Landing and Nosed Over (N7910X)

King City, CA, US

On August 11, 1991, a Cessna 172B (registration N7910X) operated by Gary C. Crowe was involved in an aviation accident near King City, CA. Investigators recorded the probable cause as: The failure of the number 3 cylinder exhaust valve, which resulted in a total loss of engine power. 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

During cruise flight, the aircraft experienced a total loss of engine power, prompting a forced landing in a field where it contacted vegetation and nosed over due to a failed exhaust valve.

What happened

The pilot was operating the aircraft during cruise flight when the engine suddenly experienced a total loss of power. With no ability to maintain altitude or continue the planned route, the pilot initiated a forced landing procedure. The aircraft was brought down into an open field. During the rollout phase after touchdown, the nose of the airplane struck high vegetation. This impact caused the aircraft to pitch forward and nosed over.

The investigation

Following the accident, the Federal Aviation Administration (FAA) conducted a detailed examination of the aircraft engine to determine the mechanical cause of the power loss. The inspection revealed that the exhaust valve on the number 3 cylinder had failed. This component failure was identified as the primary reason for the sudden cessation of engine operation.

Findings

The investigation determined that the total loss of engine power was directly caused by the failure of the number 3 cylinder exhaust valve. The subsequent nosing over during the forced landing was a result of the aircraft contacting high vegetation on the ground after touchdown.

Probable cause

The failure of the number 3 cylinder exhaust valve, which resulted in a total loss of engine power.

Frequently asked questions

What happened in the 11 Aug 1991 Cessna 172B accident near King City, CA?

During cruise flight, the aircraft experienced a total loss of engine power, prompting a forced landing in a field where it contacted vegetation and nosed over due to a failed exhaust valve.

What aircraft was involved and where did it happen?

The accident on 11 Aug 1991 involved a Cessna 172B, registration N7910X, operated by Gary C. Crowe, at King City, CA.

What was the probable cause of the accident?

The failure of the number 3 cylinder exhaust valve, which resulted in a total loss of engine power.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X17897. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.