Re 20g an article in Aviation Weeks "Business and Commercial Aviation", February 2002, on the 92 has,
The airframe itself is designed to withstand a 21 foot/second vertical crash (20g downward momentum).
“ “No such “run dry” requirement, as described in media reports, exists for civil certified rotorcraft”, said Sikorsky in a statement released late Monday evening.
Article also says,
The main gearbox is designed to go 6,000 hours between overhauls and can run completely dry for up to 30 minutes. The case is made out of WE-43A magnesium alloy, which is resistant to saltwater corrosion.
Sikorsky can't have been ignorant of the claims being printed in the press and certainly did nothing to refute what had been published.