Originally Posted by
Spunk
And we've been flying around with our -5 blades for a total of 2197 FH in a salty environment and are heading for the overhaul now to replace them with -7 blades. No delamination at all.
Perhaps there is some peculiarity in the manufacturing process which produces these variations in the blade sensitivity. Materials are often poorly understood, so sometimes a processing step turns out to be detrimental rather than beneficial.
Finding out which is very difficult, especially with a flight critical component.