What happened
The aircraft was operating during a period of poor visibility characterized by heavy cloud cover and reported fog. The incident took place in February, a time when the local mountains were covered in snow, creating potential whiteout conditions that severely reduced contrast and depth perception. During the descent phase of flight, the pilot in command was unable to maintain visual contact with the ground or surrounding obstacles. Consequently, the aircraft collided with rising terrain while attempting to navigate through the obscured environment.
The investigation
Investigation of the event focused on the environmental conditions and the pilot's situational awareness. The primary factor identified was the pilot's inability to see and avoid obstructing terrain. The combination of snow-covered mountains, overcast skies, and fog created a scenario where visual cues were insufficient for safe navigation.
Findings
The accident was attributed to the pilot's failure to maintain visual reference in deteriorating weather. The specific causal factors included:
- Inability to see and avoid obstructing terrain
- Whiteout conditions due to snow cover and fog
- Flight into clouds or fog during descent
Safety message
Pilots must exercise extreme caution when flying in mountainous terrain during winter months. Whiteout conditions can eliminate all visual references, making instrument flight rules essential even if visual flight is attempted.