With the small amount of information regarding a 360Deg crack near to or in the vacinity of a production weld joining two parts together , could indicate a production problem related to inncorrect stress relief/ normalising after heat induction caused by welding, unless carried out almost like a scientific test normalising will cause either embrittlement or loss of tensile strength.
But for so many Helis to have the same fault would need all of them to have been fitted with the same sort of faulty shaft/bevel gear from the same possibly faulty batch of shafts, which almost seems to be impossible..!
Does anyone know if this affects the Military Pumas?
Peter R-B
Lancashire