Casualties unknown

1991-10-15: Mooney M20K (N3947H) — Northern Harvest Furniture,inc — Knox, IN

Knox, IN, US

On October 15, 1991, a Mooney M20K (registration N3947H) operated by Northern Harvest Furniture,inc was involved in an aviation accident near Knox, IN. Investigators recorded the probable cause as: The pilot's inability to maintain controlled flight due to an in-flight engine failure caused by a broken connecting rod on the number 2 cylinder. 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 1781061362Data APIEditorial standards

During cruise flight at 11,000 feet, the pilot experienced a sudden loss of engine power accompanied by zero oil pressure. Despite being vectored to the nearest airport, the aircraft could not reach the runway and was forced down in a corn field.

What happened

The incident occurred while the aircraft was operating during cruise flight at an altitude of 11,000 feet. At this time, the pilot observed a significant loss of engine power along with an oil pressure reading of zero. The crew attempted to divert to the closest airport, but the airplane was unable to make it to the runway.

A forced landing was subsequently executed in a corn field. During the impact, the nose gear collapsed under the stress of the landing. Post-accident inspection revealed a broken rod on the number 2 cylinder.

The investigation

Post-accient examination of the engine components identified a mechanical failure within the internal assembly. Specifically, inspectors found that a connecting rod on the number 2 cylinder had fractured. This structural failure likely led to the immediate loss of oil pressure and subsequent engine power loss observed by the pilot prior to the forced landing.

Findings

The primary factors contributing to this event include:

  • Loss of engine power due to internal mechanical failure
  • Zero oil pressure indicating catastrophic lubrication system breakdown
  • Broken rod on the number 2 cylinder as the root cause of the engine stoppage
  • Inability to reach a suitable airport for a controlled landing

Probable cause

The pilot's inability to maintain controlled flight due to an in-flight engine failure caused by a broken connecting rod on the number 2 cylinder.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X18269. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.