Casualties unknown

Aircraft Collides with Knoll During Turn in Blowing Snow (N29033)

Humphrey, ID, US

On March 15, 1984, a Piper PA-28RT-201T (registration N29033) was involved in an aviation accident near Humphrey, ID. Investigators recorded the probable cause as: The pilot's failure to maintain visual reference to the ground during a turn in reduced visibility due to blowing snow, which resulted in controlled flight into terrain. 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 2026-06-20Data APIEditorial standards

During a cross-country flight through rising terrain and blowing snow, the pilot initiated a turn to reverse direction but encountered reduced visibility, resulting in a collision with a knoll.

What happened

The aircraft was operating during a cross-country flight when it entered an area characterized by rising terrain and blowing snow. Recognizing the deteriorating conditions, the pilot initiated a turn to reverse the direction of flight.

During this maneuver, visibility was significantly reduced due to the weather conditions. The aircraft collided with the top of a knoll located on snow-covered rolling terrain. Following the impact, the aircraft traveled approximately 400 feet before coming to rest on its right side. The collision resulted in the shedding of the engine and wings.

The investigation

Examination of the wreckage revealed that the aircraft had sustained substantial damage consistent with a collision with terrain. The engine and wings were detached from the fuselage, and the aircraft rested on its right side after traveling a distance of about 400 feet post-impact.

Findings

The primary factors contributing to this accident were the reduced visibility caused by blowing snow and the terrain itself. The pilot's decision to continue flying into deteriorating weather conditions in an area with rising terrain played a critical role in the outcome.

Probable cause

The pilot's failure to maintain visual reference to the ground during a turn in reduced visibility due to blowing snow, which resulted in controlled flight into terrain.

Frequently asked questions

What happened in the 15 Mar 1984 Piper PA-28RT-201T accident near Humphrey, ID?

During a cross-country flight through rising terrain and blowing snow, the pilot initiated a turn to reverse direction but encountered reduced visibility, resulting in a collision with a knoll.

What aircraft was involved and where did it happen?

The accident on 15 Mar 1984 involved a Piper PA-28RT-201T, registration N29033, at Humphrey, ID.

What was the probable cause of the accident?

The pilot's failure to maintain visual reference to the ground during a turn in reduced visibility due to blowing snow, which resulted in controlled flight into terrain.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001214X39173. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.