Boeing has begun flight tests of a 747-8 passenger model powered by upgraded General Electric GEnx-2B engines, which are expected to improve fuel burn by a further 1.8%. The flight tests, using RC021, an aircraft formerly destined for Lufthansa, began on May 20 with a four-hour flight from Everett, Wash. The flight evaluated the initial performance of the GEnx-2B Performance Improvement Package (PIP), as well as upgrades to the flight management computer (FMC) software. These latter ...

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