Casualties unknown

1999-04-07: Mooney M20J (N9969X) — Vienna, IL

Vienna, IL, US

On April 7, 1999, a Mooney M20J (registration N9969X) was involved in an aviation accident near Vienna, IL. Investigators recorded the probable cause as: The loss of engine power due to worn ignition points and cam follower assembly. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive; 8 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

An aircraft experienced in-flight power loss, prompting an emergency descent and forced landing in a pasture. Post-accident inspection identified worn ignition points as the cause.

What happened

The airplane experienced a complete loss of engine power while airborne. In response to the emergency, the pilot initiated a controlled descent and executed a forced landing in a nearby pasture. The terrain at the landing site was uneven, which likely contributed to the nature of the impact damage.

The investigation

Following the accident, investigators conducted a post-accident examination of the aircraft's systems. A detailed inspection of the ignition system revealed significant wear on the ignition points and the cam follower assembly. This mechanical failure prevented the engine from maintaining combustion, leading to the in-flight power loss.

Findings

The primary factor contributing to the accident was the deterioration of the ignition components. The worn ignition points and cam follower assembly failed to provide the necessary spark for engine operation. Additionally, it was noted that the pilot's certificate had been revoked prior to this flight, raising questions regarding the legality of the operation, though the mechanical failure remains the direct cause of the power loss.

Probable cause

The loss of engine power due to worn ignition points and cam follower assembly.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001205X00432. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.