riff-raff
Many thanks - a great find. I've just started going through it.
Technically it is the Army's guide but they paid Sikorsky to write it. It would be very interesting to know if the S-92 designers read or used this or some subsequent guide.
As it was written in 1979 it captures Sikorsky's thinking at the time of the UH-60 design. One would have expected the state of the art to have advanced in the subsequent 1/4 century prior to the introduction of the S-92.
The Cougar lawyers will no doubt be keen to see one document mentioned on P17 of 91 for both the UH-60 and the S-92:
The functional group charged with drive system design can contribute greatly to the reliability and maintainability of future designs by setting up and continuously updating a problem file. This file, which could be arranged by the various generic components, would essentially be a history of all of the developmental and field problems associated with past and present drive systems. The information contained in this file would consist of descriptions, causes, and solutions of the various problems. The primary purpose of this file would be to prevent past mistakes from being repeated.
It would also serve to centralize that information, which would otherwise be scattered in various memos or in the files of the engineers who worked on the past problems. This procedure also documents "experience" and keeps within the company information that othewise might be lost when experienced engineers leave.
I wonder how many of the S-92 design team actually worked on the original UH-60 in the 70s.