bad news, anyone know why they r cracking?
That's the million-dollar question that SKY is supposed to be answering. Some questions that came to my mind were (I'm sure someone on this forum can provide comments):
What specific alloy is the MGB housing manufactured from?
Is there a link between this issue and the previous AD from 2007 regarding the main transmission bolt failure?
Is there an issue with dis-similar material thermal expansion properties changing the effective torque on the mounting feet during flight operations?
Is there a background vibration issue or excessive shear force present on the mounting bolts/feet?
Is there any correlation within the HUMS data for the affected S-92a units to date that could be registered as a specific threshold signature, or are there no raw sensors close to the mountings?
Has this issue been seen before on previous helo designs, and how was it engineered out?
Now we have 2 critical areas of this MGB design that are suspect to be sub-standard, namely the filter housing studs when they were made from titanium, and now the main transmission mounting feet. Hopefully SKY will produce some answers soon before the S-92a reputation is even further destroyed...
Fly safe
Max