Photo by davidemonteleonestudio / Rolls-Royce assembly line, Derby, United Kingdom. Rolls-Royce is one of the biggest suppliers of civil turbofans in the world, so there’s a good chance you've flown on a plane powered by one of them. On the company’s production line every single detail in the construction of an engine is double-checked by machines—and humans. Many pieces are, in fact, manually assembled. Here a Trent XWB-84K, used in the Airbus 350 planes, is at its final production stage. Follow davidemonteleonestudio for more about this and other stories. #greeningaviation