Thought it would be the Tristar!
On my current type, the manuals state that Hyd power is available from a windmilling engine, but with no guidance as to what speed that is. The simulator gives us a warning of low Hyd press at around 130 kts if the PTU isn't operating. But a mate who had an engine failure for real one day said the windmilling engine kept of generating enough Hyd pressure down to about 40 knots. They didn't get a warning until they were turning off the runway!