In the never-ending hunt for just a little bit more efficiency, GE continues to upgrade its flagship high-bypass line of engines. Looks as though they hope to extract a little more energy from the core exhaust to send it to the fan by upgrading the low pressure turbines. Given the typical commercial airline profit margins, even a 1.4% improvement in SFC is probably worth it.
http://www.flightglobal.com/news/articles/ge-flies-second-upgrade-package-for-787-engine-367680/
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