Pratt Pledges 3% Reduction in F135 Cost Pratt & Whitney will reduce the unit recurring flyaway (URF) cost of the F135 engine by 3% over a three-year ordering period for Lockheed Martin F-35s scheduled for delivery from 2020-22, the company says.  Pratt confirmed the URF cost reduction after announcing on Oct. 2 a $5.7 billion contract to deliver 332 engines during low-rate initial production lots 12-14. The award comes several months after the planned deadline at the end of last ...

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