Really tragic. I am acquainted with one of the engineers who donates his time to help service the engines on these aircraft. He tells me these are the only JU-52s still flying with the BMW 132 radial engines which were essentially reverse-engineered versions of an earlier P&W R-1690 Hornet design but with metric measurements throughout. All other JU-52s either shipped with P&Ws or were switched in later life, apparently due to ease of sourcing compatible parts. The engineers at Dübendorf laboriously and lovingly maintain these unique aircraft and apparently flight:maintenance hours ratio is well over 30. They are a common, beautiful sight all over eastern Switzerland and I hope this awful accident isn’t the end.