Lack of lubrication certification for helicopter gearboxes

[etudiant]

Originally Posted by SASless

Within a page or two...you get a very quick answer to your question.

I did not read further as it is early and I am just getting into my first Cup of Coffee!


https://ntrs.nasa.gov/archive/nasa/c...9910005833.pdf

Thank you, a very interesting document.
It suggests that Russian helicopters don't much use planetary gear arrangements in their transmissions.
Why not is a question that requires a level of knowledge and expertise that only an industry professional could muster, if they are willing to offer it.