As Pratt & Whitney nears completion of the extensive F135 system development and demonstration (SDD) program for the F-35 Joint Strike Fighter engine, the company is revealing new details of a proposed upgrade that could cut fuel burn by as much as 7% on aircraft entering service by the early 2020s. The upgrade package builds on a fuel-burn reduction technology effort driven by the U.S. Navy and an improved compressor developed by Pratt. Initial test results have been positive and are ...


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