On August 24, 1992, a Piper PA-12 (registration N7887H) operated by Stepovich, Christopher A. was involved in an aviation accident near Harding Lake, AK. Investigators recorded the probable cause as: The pilot's decision to use automotive fuel in an engine not approved for such use, which resulted in a partial loss of engine power. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
A pilot experienced partial engine power loss shortly after takeoff, necessitating an off-airport forced landing that caused substantial damage to the aircraft.
What happened
The pilot reported experiencing a partial loss of engine power immediately following takeoff. This mechanical issue necessitated an off-airport forced landing, which resulted in substantial damage to the airplane. Following the accident, the engine was tested and operated normally without any issues that could be considered causal to the initial power loss.
The investigation
Post-accident analysis was conducted on the fuel drained from the airplane. The examination indicated that the aviation fuel had been blended with automotive fuel. It is important to note that the specific engine installed in the aircraft was not approved for the use of automotive fuel.
Probable cause
The pilot's decision to use automotive fuel in an engine not approved for such use, which resulted in a partial loss of engine power.