Casualties unknown

Fuel Valve Misinstallation Leads to Engine Failure During Climbout (N40872)

Willow, AK, US

On April 13, 1990, a Piper PA-18 (registration N40872) was involved in an aviation accident near Willow, AK. Investigators recorded the probable cause as: The pilot's decision to switch fuel tanks while operating an aircraft with a newly installed but incorrectly positioned fuel valve, which resulted in engine power loss. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.

Sourcesthe U.S. National Transportation Safety Board (NTSB) historical archivePrimary reportUpdated 2026-06-10Data APIEditorial standards

Engine failure occurred during climbout after the pilot switched fuel tanks, leading to a crash in a wooded area due to an incorrectly installed new fuel valve.

What happened

During the initial climbout phase of flight, the pilot initiated a switch between the aircraft's fuel tanks. Shortly after this action, the engine ceased operation, resulting in a loss of power. The airplane subsequently descended and impacted a wooded area. Upon inspection, the aircraft was found to be substantially damaged. Despite the severity of the impact, the pilot sustained no injuries.

The investigation

A mechanical examination of the aircraft was conducted to determine the cause of the engine failure. Investigators discovered that a new fuel valve had been installed on the airplane just prior to the flight. Further analysis revealed that this component had been installed incorrectly, which likely disrupted the fuel flow when the pilot attempted to switch tanks.

Findings

The primary factor contributing to the accident was the improper installation of the fuel valve. This mechanical error prevented the engine from receiving adequate fuel during the tank switch, leading to engine failure and the subsequent crash. The incident highlights the critical importance of correct component installation procedures.

Probable cause

The pilot's decision to switch fuel tanks while operating an aircraft with a newly installed but incorrectly positioned fuel valve, which resulted in engine power loss.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X22831. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.