On March 13, 1984, a Piper J3C-65 (registration N68925) was involved in an aviation accident near Elmira, OR. Investigators recorded the probable cause as: The pilot's decision to operate the aircraft using automotive fuel, which resulted in engine power loss and a subsequent collision with power lines and trees after entering a departure stall while attempting to avoid obstacles. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
An aircraft experienced a power loss during the initial climb phase of takeoff, resulting in a collision with power lines and trees. The pilot attempted to maneuver around obstacles but entered a stall.
What happened
The aircraft suffered a complete loss of engine power while executing the initial climb immediately following takeoff. During this critical phase of flight, the pilot initiated a climbing turn in an effort to avoid nearby power lines and trees. However, the maneuver resulted in the aircraft entering a departure stall. The aircraft subsequently collided with the power lines and surrounding trees.
The investigation
Post-accident examination revealed that the aircraft was operating on automotive fuel rather than approved aviation-grade gasoline. An FAA inspector examined the ignition system and reported that the magneto switch was positioned to utilize only the left magneto, which may have contributed to the engine's inability to sustain power.
Findings
The primary factors leading to this accident included the use of automotive fuel, which is not approved for aircraft engines, and the resulting engine failure. The pilot's attempt to avoid obstacles during a low-altitude maneuver led to an aerodynamic stall from which recovery was not possible before impact.
Probable cause
The pilot's decision to operate the aircraft using automotive fuel, which resulted in engine power loss and a subsequent collision with power lines and trees after entering a departure stall while attempting to avoid obstacles.