Swiss media seem to report an eyewitness account by some Swiss military pilot on the ground from
ten minutes before the crash who claimed to have seen the aircraft stalling when banking left and recovering with high engine power. If the conditions were so marginal there had been other routes available away from high terrain.
Tagesanzeiger.ch/Newsnet spoke with a witness, a military pilot from the region. He was in his garden when he heard the loud and familiar buzzing of the Ju-52. He believes that the pilots had a serious control problem. He watched as the plane flew across the valley, made a left turn - and then abruptly flipped left ahead. "Such maneuvers were done earlier to simulate the failure of an engine. But nobody does that to passengers, "he says. Then an engine howled loudly, seconds later the plane was balanced again and continued the flight normally.
https://www.tagesanzeiger.ch/schweiz...story/30287960