As far as I can tell it is the upwind engine. See the explanation in "Flying the Big Jets" (not HTBJ the one about the 777).
There are a few apparent errors in "Ace The Technical Pilot Interview". There is a question about wide cord fan blades that says the cord is from the engine hub to the blade tip. That's not what Rolls Royce reckon and they invented them.
It's a useful book but only a start on the more in depth questions.