How long would it take for an S-92 at its service ceiling (FL20?) be able to decend then line up for a gentle controlled ditching from the time the pressure dropped below 5 psi?
The S92 is pants but I think even it can manage more than 2000' - or maybe you meant FL200?
But don't forget that if you get on with it and descend in near-autorotation, there is very little power going through the transmission and tail rotor drive, thus much less heating effect and probably considerable "dry running time" - not that I want to put that to the test
Anyway, isn't max altitude without oxygen FL100 in EASA-land? I doubt there are many S92s flying around above FL100.
I've known Nick a long long time and he has never put out anything untrue
Perhaps true, but plenty that confused or misled.
HC