Pratt & Whitney clears design review for F-35 engine upgrade

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Go back to Pratt & Whitney clears design review for F-35 engine upgrade

RTX's Pratt & Whitney completes F135 Engine Core Upgrade Risk Reduction Design Review

September 15, 2026 7:00 AM EDT

Program remains on track to enable F-35 Block 4 and beyond capabilities

EAST HARTFORD, Conn., Sept. 15, 2026 /PRNewswire/ -- Pratt & Whitney, an RTX (NYSE: RTX) business, has successfully completed the F135 Engine Core Upgrade (ECU) Risk Reduction Design Review (RRDR), a major program milestone that validates the maturity of the ECU design and advances the program toward... More