Here is some information on an accident that happened to a Bücker here in Spain in Málaga , this Bucker lost the propeller in flight!!!! the crankshaft was broken and the pilot and his passenger landed in a near field both without any injuries. The pilot did a fantastic job because the area where they landed was full of cables and no any flat surface around, they were very lucky!!!
I send you some photos where you can see that crank broken and if you see the cracks they are complete BLACK indicating that they are very old cracks indeed. Now the Bücker owners we are waiting to received from the Spanish aviation authority a bulletin saying that we must inspect all the crankshaft at this point...
