RTX’s Pratt & Whitney Clears Key F135 Upgrade Milestone for F-35 Block 4

‼️ ✈️ RTX’s Pratt & Whitney has completed the design review for its F135 Engine Core Upgrade, moving the program closer to F-35 production. The upgrade is designed to deliver the added power and cooling capacity needed for the jet’s Block 4 modernization, which introduces advanced sensors, weapons and other systems across all three F-35 variants.

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