On September 26, 1991, a Cessna 172N (registration N9403E) operated by Leslie E. Jantzer was involved in an aviation accident near Chiloquin, OR. Investigators recorded the probable cause as: The loss of engine power due to excessive wear of the magneto point cam followers, which resulted from inadequate lubrication. 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.
An aircraft experienced a complete loss of engine power during cruise flight, forcing the pilot to execute an emergency landing on rough terrain. Investigation revealed excessive wear on magneto components caused by insufficient lubrication.
What happened
The aircraft experienced a sudden loss of engine power while flying in cruise conditions. Unable to maintain altitude or reach a suitable airfield, the pilot initiated a forced landing procedure. During the ground roll of the landing attempt, the aircraft impacted rough terrain, resulting in significant structural damage.
The investigation
A post-accident inspection of the aircraft revealed critical mechanical failures within the ignition system. Specifically, the points within the magnetos failed to open properly, preventing the generation of an electrical spark necessary for engine operation. Further examination determined that the cam followers on both magnetos were excessively worn down. This level of wear was attributed to a lack of proper lubrication over time, which ultimately caused the ignition system to fail completely.
Probable cause
The loss of engine power due to excessive wear of the magneto point cam followers, which resulted from inadequate lubrication.
What happened in the 26 Sept 1991 Cessna 172N accident near Chiloquin, OR?
An aircraft experienced a complete loss of engine power during cruise flight, forcing the pilot to execute an emergency landing on rough terrain. Investigation revealed excessive wear on magneto components caused by insufficient lubrication.
What aircraft was involved and where did it happen?
The accident on 26 Sept 1991 involved a Cessna 172N, registration N9403E, operated by Leslie E. Jantzer, at Chiloquin, OR.
What was the probable cause of the accident?
The loss of engine power due to excessive wear of the magneto point cam followers, which resulted from inadequate lubrication.
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