General Electric says a newly-defined performance improvement package (PIP) will bring the Boeing 747-8 engine to within 1% of fuel-burn targets, but acknowledges additional upgrades will be needed to close the final gap with a follow-on upgrade package. The PIP will tackle the bulk of a 2.7% shortfall in specific fuel consumption discovered during flight tests of the GEnx-2B67-powered 747-8-8F freighter. The engine, common to both the cargo and passenger versions of the 747-8, is ...

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