Casualties unknown

1986-06-07: Piper PA-25 (N6190Z) — John O. Winden — Williston, ND

Williston, ND, US

On June 7, 1986, a Piper PA-25 (registration N6190Z) operated by John O. Winden was involved in an aviation accident near Williston, ND. Investigators recorded the probable cause as: The pilot's failure to maintain visual reference with the terrain due to unfamiliarity with the area and downwind conditions causing the aircraft to be blown into a hillside. 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 1781061362Data APIEditorial standards

A pilot unfamiliar with the local geography failed to recognize the height of a hill ahead, attempting a turn back in downwind conditions that pushed the aircraft into the slope.

What happened

The pilot reported being unfamiliar with the geographical area during this flight. While navigating, he focused his attention on power lines and the road below, which led to a misjudgment of the terrain ahead. He did not realize that the hill in front of him was as high as it appeared until it was too late to avoid it.

Upon realizing the proximity of the obstacle, the pilot attempted to turn back out of the situation. However, due to downwind conditions, the aircraft was blown into the hillside. The pilot stated that the wind was blowing at 10 knots at the time of the incident.

The investigation

The investigation relied heavily on the pilot's statement regarding his lack of familiarity with the area and his visual references during the flight. No mechanical issues were cited in the provided source text.

Findings

  • Pilot unfamiliarity with the geographical area contributed to the inability to accurately assess terrain height.
  • Failure to recognize hill height due to focusing on ground features like power lines and roads.
  • Downwind conditions caused the aircraft to drift into the hillside during the attempted turn back.

Safety message

Pilots should be aware that focusing on ground references can lead to misjudgments of terrain height, especially in unfamiliar areas. Downwind conditions can significantly affect aircraft control and trajectory during critical maneuvers.

Probable cause

The pilot's failure to maintain visual reference with the terrain due to unfamiliarity with the area and downwind conditions causing the aircraft to be blown into a hillside.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001213X33835. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.