Originally Posted by
SASless
The only hydraulic connection to the Engines on a Chinook are to the Engine Starters as they are driven by the Utility Hydraulic System....and that is not connected to the Flight Control System.
Perhaps finding the report on the Incident might provide a better insight into what actually happened.
https://assets.publishing.service.go...987_G-BISO.pdf I don't think there is a suggestion of a direct connection in the systems, more just general aircraft and hydraulic rig cleaning. But several other failures stated. Sounds like quite a ride and credit to the crew in their attempts to analyse the fault and keep level headed.