On May 20, 1990, a Piper PA-18A (registration N9071D) was involved in an aviation accident near Creve Coeur, MO. Investigators recorded the probable cause as: The pilot's failure to drain the fuel sumps prior to flight, which resulted in water contamination of the fuel system and subsequent engine power loss. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
A commercial pilot experienced engine power loss during a banner drop operation due to water-contaminated fuel, resulting in a forced landing and substantial aircraft damage.
What happened
The commercial pilot reported that he had just completed a banner drop when he re-entered the downwind leg at approximately 40 feet above ground level. During the turn from downwind to base leg, the pilot switched fuel tanks. Shortly after this action, the aircraft experienced a loss of power. The pilot attempted an emergency landing in a tall wheat field. Upon impact, the aircraft nosed over and sustained substantial damage.
The investigation
A post-accident inspection of the aircraft revealed that the fuel system was contaminated with water. The pilot stated that he had not drained the fuel sumps prior to the flight.
Findings
The investigation determined that water contamination in the fuel system was a primary factor in the engine power loss. Contributing to this failure was the pilot's decision not to drain the fuel sumps before operating the aircraft.
Probable cause
The pilot's failure to drain the fuel sumps prior to flight, which resulted in water contamination of the fuel system and subsequent engine power loss.
What happened in the 20 May 1990 Piper PA-18A accident near Creve Coeur, MO?
A commercial pilot experienced engine power loss during a banner drop operation due to water-contaminated fuel, resulting in a forced landing and substantial aircraft damage.
What aircraft was involved and where did it happen?
The accident on 20 May 1990 involved a Piper PA-18A, registration N9071D, at Creve Coeur, MO.
What was the probable cause of the accident?
The pilot's failure to drain the fuel sumps prior to flight, which resulted in water contamination of the fuel system and subsequent engine power loss.
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