Hi again.....
Yes, you're quite correct 'Tired', there is a great deal more to ETOPS than 'just' fuel - as I mentioned in the last but one line.
Perhaps though, it could be stated that the 'bottom line' (not the bottom line in my last post!) is FUEL.
In other words, assuming the aircraft is cleared for ETOPS (i.e. it has the required system redundancy as you correctly mention, plus ALL the other multitude of requirements), it is then the responsibility of the crew to ensure that sufficient fuel is loaded
before departure, to achieve the worst case scenario should it occur during the flight.
Anyone with additional info, please continue, to help '767bill' with his question.
Cheers..........'pjumbo'