John D, appreciate your knowledge sharing of the Blackhawk design, hopefully valuable design lessons can be learned for the S-92b when it invariably comes out.
Can you please confirm how many mounting studs are on the UH-60, 3 as in the S-92? Also, can you confirm if the UH-60 does indeed have 30-minute dry-run capability? What is the vibration level in a UH-60 like compared to a S-92a?
I'm assuming that there is a sump drain plug but with a bottom-mounted filter housing there will be a certain amount of residual oil retained during changeout/inspection. On the plus side the PAX would hopefully be able to visually confirm an oil leak and inform the pilot to commence the RFM procedure.
FYI Cougar are officially test-flying the S92 over St. John's and the sole survivor from flight 491 has been released from hospital to continue his recovery at home, but will probably not share his account of events for a few more weeks yet.