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Helicopter Engine Stoppage Leads to Hard Landing and Fire Following Washing (N477JM)

Merced, CA, US

On October 11, 1990, a Bell 47G4 (registration N477JM) operated by John W. Myers was involved in an aviation accident near Merced, CA. Investigators recorded the probable cause as: LOSS OF ENGINE POWER FOR AN UNDETERMINED REASON. 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

A helicopter on a business flight experienced an engine stoppage after washing. The pilot attempted an autorotative descent, but the helicopter landed hard and caught fire. Post-accident examination found no preimpact mechanical malfunction or failure.

Accident Details

After washing the helicopter, the pilot took off for a business flight over his ranch. During the flight, a ground witness heard the engine stop. The witness then observed the helicopter enter an autorotative descent. The helicopter subsequently landed hard and burst into flames. The witness estimated that the helicopter's altitude was approximately 50 feet above the ground at the time of initial observation.

Post-Accident Examination

A thorough post-accident examination of both the helicopter and its engine was conducted. The examination revealed no evidence of any preimpact mechanical malfunction or failure. The exact cause of the engine stoppage was not determined by the investigation.

Outcome

The helicopter sustained significant damage due to the hard landing and subsequent fire. No information was provided regarding injuries or fatalities.

Engine failure

Frequently asked questions

What happened in the 11 Oct 1990 Bell 47G4 accident near Merced, CA?

A helicopter on a business flight experienced an engine stoppage after washing. The pilot attempted an autorotative descent, but the helicopter landed hard and caught fire. Post-accident examination found no preimpact mechanical malfunction or failure.

What aircraft was involved and where did it happen?

The accident on 11 Oct 1990 involved a Bell 47G4, registration N477JM, operated by John W. Myers, at Merced, CA.

What was the probable cause of the accident?

LOSS OF ENGINE POWER FOR AN UNDETERMINED REASON.

More accident analyses

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X24487. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.