HC the good news is that there are light, medium and heavy twins that have been sucessfully tested to simulate an uncontained oil loss from anywhere in the oil system AND have no history of leaks either.
There is also a rule called the design assessment, 29-917, that requires the OEM to assess and minimise all geqrbox failures modes that would be catestrophic or require an immediate landing - just like Cougar faced. When Sikorsky fall back on their defence that the RFM says to land immediately they simply show they failed to meet that requirement:-
http://www.pratt-whitney.com/StaticF...Links_0409.pdf
As an additional safety precaution, in the event of total loss of oil
pressure, a “Land Immediately” instruction is directed by the flight
manual and a controlled landing can be executed.
A burning question is:-
What is Sikorsky doing for the S-76D test?