Casualties unknown

Engine Failure Due to Improper Fuel Selector Valve Installation (N1668P)

Battle Ground, WA, US

On November 15, 1997, a Piper PA-18-150 (registration N1668P) was involved in an aviation accident near Battle Ground, WA. Investigators recorded the probable cause as: Improper reinstallation of the fuel selector valve handle assembly by the pilot, and improper inspection by a mechanic that eliminated the detent function. 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

A private pilot improperly reinstalled the fuel selector valve handle, causing fuel starvation and engine failure during flight. The pilot was seriously injured in a forced landing. A mechanic's improper inspection also contributed.

Accident Details

The private pilot had removed the fuel selector valve handle assembly and had the placarded backing panel painted. During reinstallation, the pilot placed the handle and pointer 90 degrees counterclockwise from the correct selector valve position. On the accident flight, the handle was positioned to indicate the right tank position, but the actual valve was in the fuel shutoff position. The engine subsequently starved of fuel and quit. The pilot initiated a forced landing onto wooded terrain and was seriously injured.

Post-Accident Examination

Examination of the fuel selector valve revealed that it had been improperly inspected by a mechanic, which eliminated the detent function only. The engine fuel primer was found unlocked. Examination of the engine and airframe did not reveal any other preimpact mechanical discrepancies.

Pilot Background

The pilot had been denied a medical certificate due to an unexplained history of alcohol abuse. The Federal Aviation Administration revoked the pilot's airman certificate for failure to provide blood test results from blood drawn after the accident.

Probable cause

Improper reinstallation of the fuel selector valve handle assembly by the pilot, and improper inspection by a mechanic that eliminated the detent function.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001208X09246. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.