On all of the various jet aircraft that I have flown, a windmilling engine (ie flamed-out but not mechanically failed) would still drive the relevant hydraulic pump(s) fast enough and therefore maintain adequate pressure in that system.
Having watched thousands of engine start cycles over the years, the Hyd pump coming 'on-line' is invariably one of the first things to occur as the engine rpm builds.
When airborne, I know an engine's windmilling rpm is a function of IAS, but are the RJ85 guys telling us that these guys having flamed-out all 4 engines would have had the indications of a total Hyd failure?
Last edited by H Peacock; 17th Dec 2016 at 22:06.