On April 6, 1998, a Mooney M20F (registration N9131V) was involved in an aviation accident near Lodgepole, MT. Investigators recorded the probable cause as: The pilot's failure to maintain clearance from trees while maneuvering through forested mountainous terrain in adverse weather conditions, including low ceilings, fog, snow showers, and drizzle. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
A pilot intentionally flew into adverse weather conditions over forested mountainous terrain. Limited visibility due to low ceilings, fog, and snow showers resulted in a failure to maintain adequate clearance from the trees.
What happened
The pilot made the decision to intentionally enter an area of adverse weather along his intended flight path. The environment consisted of forested, mountainous terrain with significantly limited visibility. Conditions included low ceilings, fog, snow showers, and drizzle.
While navigating through this difficult terrain, the pilot was unable to maintain proper clearance from the surrounding trees. The combination of poor weather and challenging topography led to a collision with the vegetation.
Findings
The primary factors contributing to the incident were the adverse weather conditions and the decision to fly into them. The limited visibility caused by low ceilings, fog, and precipitation prevented the pilot from maintaining safe clearance from the mountainous terrain.
Probable cause
The pilot's failure to maintain clearance from trees while maneuvering through forested mountainous terrain in adverse weather conditions, including low ceilings, fog, snow showers, and drizzle.