Fatal Accident Switzerland
The wreckages also seems to be on the windward side of the ridge. No clouds either. Doesn't add up. It is usually smooth on the windward side of the mountain and the turbulence starts on the leeward side. At least that's what I experienced when I attempted to fly across a 6000 ft ridgeline.
Join Date: Dec 2014
Location: LHBS
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Surface winds in the wider area (Sion, Milano) were weak, westerly or variable, so the likelihood of mountain wave activity is low.
Nevertheless, insolation of the easterly surface on such a clear day can produce powerful thermals by this time in the morning. Since the western / northern side of the pass is colder, this can cause a strong vertical gust over the pass. This might be a viable speculative scenario. why the wreckage fell onto the eastern side.
(Or CO poisoning.)