Step Change latest ;
Eurocopter has recreated the conditions for cracks to occur in the main gearbox vertical shaft. The crack propagation rate has also been verified using bench testing on eight different main gearbox vertical shafts.
From Eurocopter perspectives, the most probable cause is a specific combination of factors, the main ones being a specific combination of residual stress and corrosion of the vertical shaft.
Will you guys be happy to fly them on the basis of that ?