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A major sustainment contract for the F-35 Lightning II’s engine will strengthen global fighter readiness, with RTX’s Pratt & Whitney securing a $1.3 billion agreement to maintain, repair and upgrade the propulsion systems.
RTX’s Pratt & Whitney has been awarded a $1.3 billion contract to support the long-term sustainment of the F135 engine, ensuring continued availability of the propulsion system that powers all three variants of the F-35 Lightning II fighter aircraft.
The agreement will provide critical sustainment activities, including engine maintenance, repair, spare parts, engineering support, software sustainment and associated support equipment for US and international F-35 operators.
The contract comes as the global F-35 fleet continues to expand, with more than 20 nations operating or committed to the aircraft. As the backbone of the program’s propulsion system, the F135 engine remains central to maintaining operational availability across air forces flying the conventional take-off and landing, carrier variant and short take-off and vertical landing versions of the aircraft.
For Australia, which operates a growing fleet of F-35A fighters and is investing heavily in maintaining sovereign combat air capability, the contract reinforces the importance of a resilient global sustainment network supporting the Lightning II enterprise.
The sustainment agreement also supports the continued evolution of the F135 through the Engine Core Upgrade program, which is designed to improve engine durability, increase power and cooling capacity, and enable future F-35 Block 4 capabilities.
Pratt & Whitney has argued that sustaining and modernising the F135 is essential to ensuring the F-35 remains capable against increasingly sophisticated threats, particularly as adversaries field advanced air defence systems and electronic warfare capabilities.
The latest award follows significant recent investment in the F135 industrial base, including multibillion-dollar production and upgrade contracts aimed at increasing manufacturing capacity, improving supply chain resilience and supporting growing international demand.
Chris Johnson, vice president of Pratt & Whitney’s F135 Program said: “Ensuring the F135 remains mission-ready is critical to the success of the F-35 enterprise.”
Beyond supporting individual aircraft, the contract highlights the broader challenge of sustaining fifth-generation capabilities. Unlike previous fighter aircraft, the F-35 relies on a global ecosystem of specialised maintenance facilities, software updates, supply chains and industrial expertise to maintain its technological advantage.
“This contract will help strengthen our global sustainment network to ensure operators around the world can continue to rely on the F135’s unmatched performance,” Johnson said.
As Australia and its allies continue transitioning towards highly integrated air combat networks built around stealth aircraft, advanced sensors and long-range weapons, the ability to sustain those capabilities over decades will become as strategically important as acquiring them.
The Pratt & Whitney agreement ensures the F135 engine remains supported as the F-35 fleet expands and evolves, reinforcing the industrial foundations underpinning one of the most significant allied airpower programs of the modern era.
Stephen Kuper
Steve has an extensive career across government, defence industry and advocacy, having previously worked for cabinet ministers at both Federal and State levels.
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