Pratt & Whitney is starting initial service-release tests of the short-takeoff/vertical-landing (Stovl) F135 version as it closes on the final phases of engine development for the F-35 Joint Strike Fighter. The start of Stovl proving runs at the company’s West Palm Beach, Fla., test site comes as Pratt begins a steady ramp-up of engine production for Lockheed Martin’s Fort Worth assembly line. Three production conventional-takeoff-and-landing and carrier version (CTOL/CV) F135s have ...


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