Pratt & Whitney�s F135 Program Surpasses 2,500 SDD Test HoursPratt & Whitney�s F135 program has surpassed 2,500 System Development and Demonstration (SDD) test hours. This significant milestone, represents the cumulative hours of F135 SDD testing, including both Conventional Take-Off and Landing (CTOL)/Carrier Variant (CV), and Short Take-Off and Vertical Landing (STOVL) configuration tests.
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