Pratt & Whitney on Track for F-35 Engine Upgrade After Completing Key Design Review

Pratt & Whitney, a subsidiary of Raytheon Technologies Corporation (RTX), achieved a significant milestone on July 15, 2024, with the successful completion of the preliminary design review (PDR) for the F135 Engine Core Upgrade (ECU) program. This review process signifies a critical step forward in modernizing the propulsion system of the F-35 Lightning II fighter jet. The F135 engine is the heart of the F-35, and the ECU program aims to enhance its durability and performance. 

This upgrade is crucial for enabling the full capabilities of the F-35 Block 4 and future iterations of the aircraft. The F-35 operates in three variants for the US Air Force, Navy, and Marine Corps, and all will benefit from the ECU program. The PDR involved a comprehensive evaluation by Pratt & Whitney and the F-35 Joint Program Office. The focus was on assessing the proposed design changes and the integration of advanced propulsion technologies. These advancements aim to restore the engine's full lifespan and unlock improved performance to accommodate next-generation weaponry and sensor systems.

"Pratt & Whitney is leveraging technology from various development programs to upgrade the F135 engine," said Chris Johnson, vice president of Pratt & Whitney's F135 program. "This will deliver increased capability and performance for the warfighter." The successful PDR is a positive indicator for the ECU program, demonstrating that the design is on schedule and exceeding expectations. 

This achievement comes after the US government granted Pratt & Whitney the green light to resume F135 engine deliveries in February 2024, following a brief halt due to safety concerns. With the PDR completed, Pratt & Whitney can move forward with the next development stages of the ECU program. This paves the way for the continued development of a more powerful and reliable engine, ensuring the F-35 remains a dominant force in air combat for years to come.