You often see a turbine rotating on the ground. Presumably engineers can apply a brake if they wish to inspect the fans - can anyone confirm this?
I know that wind milling props caused a lot of drag and I've read a couple of books where the flight engineer deliberately tried to freeze the engine by cutting off the oil supply - I suppose a seized engine is expensive - but not nearly as much as an aircraft that doesn't get down safely.
As a matter of interest does a wind milling turbofan create much drag?