We’re still collecting data for this aircraft. Routes appear once we’ve seen it fly enough times.
the pilot's failure to maintain control of the helicopter, and his improper use of night vision goggles (NVG). Contributing factors were the pilot's spatial disorientation, his self-induced pressure to return the helicopter to its home base, his lack of experience in the use of NVG's, his use of exterior lights on a dark night light, under overcast skies, and against snow-covered terrain.
Eurocopter AS 350 B3