Casualties unknown

Practice Touch and Goes Precede Accident; Fuel Sample Contaminated with Water (N9396D)

Rosemount, MN, US

On August 5, 1998, a Piper PA-18-150 (registration N9396D) was involved in an aviation accident near Rosemount, MN. Investigators recorded the probable cause as: The loss of engine power due to water-contaminated fuel and the pilot's failure to maintain adequate airspeed which resulted in a stall. 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

During touch-and-go practice, a witness observed a wing rock followed by a left wing and nose drop. Investigation found water contamination in a fuel sample from the left wing.

Synopsis

The accident occurred while the pilot and second pilot were practicing touch and goes. Witnesses reported the activity had been ongoing for approximately 30 minutes prior to the incident.

Witness Observation

A witness reported seeing the airplane climbing out from runway 27 at an estimated altitude of 300 to 500 feet above ground level. The airplane appeared to perform a wing rock to the right, after which the wings leveled momentarily. Subsequently, the left wing and nose dropped to the left, and the airplane descended straight down.

Aircraft Examination

Post-accident examination revealed leading edge damage on the blade underneath the engine, accompanied by chordwise scratching on both the front and back of the blade. The propeller dome displayed rotational and torque signatures. Continuity was confirmed through the engine drive train and flight controls.

Fuel Analysis

Fuel samples were taken from the left wing. Laboratory testing indicated that one sample was contaminated with water.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001211X10783. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.