As installed bases age, and the pressures to cut fuel burn mount, engine makers are mining ever deeper into their technology stockpiles to develop new upgrades and keep existing customers on their side. For Rolls-Royce, the process of developing one-off enhancement performance (EP) packages has gradually morphed into a broader initiative of continuous improvements across the family lineup, ranging from out-of-production RB211-524s to the latest Trent 900/1000 and yet-to-be-fielded Trent ...

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