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ASN Wikibase Occurrence # 190800
Last updated: 2 December 2021
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Type:Silhouette image of generic CH75 model; specific model in this crash may look slightly different
Zenair STOL CH 750
Registration: N8681
MSN: 75-8681
Fatalities:Fatalities: 0 / Occupants: 1
Aircraft damage: Substantial
Location:Rice County, Morristown, MN -   United States of America
Phase: Landing
Departure airport:Morristown, MN (NONE)
Destination airport:Morristown, MN (NONE)
Investigating agency: NTSB
The private pilot reported that he had started, warmed up, and then shut down the engine about 1 hour before the accident flight. Shortly after takeoff for the personal flight, the airplane’s engine lost total power. Subsequently, the pilot conducted a forced landing on a hill, which resulted in substantial damage to the nose landing gear, fuselage, and left wing.
The pilot said that he had fueled the airplane that morning with 82-octane automotive fuel that he had recently purchased from a service station. However, postaccident examination revealed that the fuel was yellow in color and smelled like “aged” automobile fuel. The top spark plugs appeared aged, and the electrodes were corroded, which could have affected engine performance. The airplane was not equipped with a fuel vapor return line to prevent fuel vapor lock. Given that old automotive fuel was found in the fuel system and that a fuel vapor return line had not been installed, it is likely that the engine lost power due to vapor lock. It is also likely that the corrosion of the spark plugs and the spacing of the electrode gaps contributed to the loss of engine power.

Probable Cause: A total loss of engine power due to fuel vapor lock. Contributing to the loss of engine power were the corrosion of the spark plugs and the spacing of the electrode gaps.


FAA register:

Accident investigation:
Investigating agency: NTSB
Status: Investigation completed
Download report: Final report

Revision history:

21-Oct-2016 18:25 Geno Added
19-Aug-2017 14:56 ASN Update Bot Updated [Time, Operator, Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative]

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