RHC Service Bulletin- You shape the new blades to stop the cracks?
Evidently there is a new SB from RHC requiring owners to modify the blade shape on -7 blades to reduce stress concentrations??? R44 SB 89 23 Feb 2015 refers.
Surely they did fatigue testing of the -7 blades as part of the certification program???? Or did they just grandfather the design from the old stainless skins? Given the relatively low hours on the NZ cracked wing, you would expect that any plausible fatigue test would pick up the problem before the blades went into service?
The plot sickens!
Blakmax