Originally Posted by
HeliMannUK
I dont think the accessories can last that long without oil but still flying on the APU & backup hyd is better than not flying. Maybe the supplemental supplies oil to the accessories?
I think if you reached the stage where the AC Gens and 1/2 hydraulic pumps have mechanically failed due to lack of lubrication, you have really stretched your luck!
I can say, though, that during prolonged churning the AC Gens will trip offline due to overheating (being normally cooled by the MGB oil). We lost No 1 and I don’t know how long No 2 would have stayed online. This then revealed a stuck AC bus relay, so No 1 AC bus dropped offline and took the No 1 and Backup DC Converters with it.