Pratt & Whitney Secures $1.6B F135 Engine Sustainment Contract

This article is based on an official press release from RTX. See the original release for full details.

Pratt & Whitney Secures $1.6 Billion Contract for F-35 Engine Sustainment

RTX business Pratt & Whitney has been awarded a contract worth up to $1.6 billion to provide sustainability support for the F135 propulsion system, the engine that powers the F-35 Lightning II aircraft. Announced on December 2, 2025, the agreement covers maintenance, repair, and engineering support for the global fleet, ensuring operational readiness for the United States and its international allies.

According to the company’s official statement, the award is structured as an Undefinitized Contract Action (UCA). This contracting vehicle allows work to commence immediately while final terms are negotiated, highlighting the Department of Defense’s prioritization of fleet readiness. The contract supports all three variants of the fighter, the F-35A, F-35B, and F-35C, and is expected to run through November 2026.

Scope of Work and Global Operations

The contract encompasses a wide range of critical logistics and engineering services designed to keep the F135 engine operational. Pratt & Whitney stated that the scope includes depot-level maintenance and repair, propulsion system integration, material management, and the replenishment of spare parts. Additionally, the agreement covers software sustainment and engineering support.

Work will be distributed across a substantial domestic and international network. According to RTX, approximately 40% of the work will be performed in East Hartford, Connecticut, with another 21% taking place in Oklahoma City, Oklahoma. Other U.S. performance locations include Florida, Indiana, and Texas.

Reflecting the F-35’s status as a global coalition aircraft, the sustainment efforts will also involve international facilities. The press release lists key locations in Norway, the Netherlands, Japan, Australia, Italy, and the United Kingdom as part of the support network.

“F-35 operators worldwide depend on the F135 for the power and performance their missions demand, and this award helps us maintain readiness rates that enable the warfighter to accomplish their critical missions.”

, Kinda Eastwood, Vice President of F135 Sustainment at Pratt & Whitney

Program Context and Fleet Readiness

This sustainment award follows a period of significant activity for the F135 program. In August 2025, Pratt & Whitney received a $2.8 billion production contract for Lot 18 engines. With over 1,300 production engines delivered to date, the focus has increasingly shifted toward maintaining the aging fleet while simultaneously producing new units.

AirPro News Analysis: The Significance of the UCA

The decision to utilize an Undefinitized Contract Action (UCA) is noteworthy. In defense contracting, a UCA is typically employed when the government’s need for supplies or services is urgent and cannot wait for the lengthy process of finalizing a definitive contract. By authorizing immediate work, the Pentagon is signaling that maintaining F-35 engine readiness is a critical priority that supersedes administrative finality.

This urgency aligns with the current geopolitical landscape. With F-35 assets critical to deterrence strategies in Eastern Europe and the Middle East, any gap in propulsion maintenance could directly impact mission assurance. The UCA mechanism ensures that the flow of spare parts and depot repairs continues uninterrupted.

Long-Term Sustainment and Upgrades

While this $1.6 billion contract addresses immediate sustainment needs through late 2026, the F-35 program faces broader long-term challenges regarding operating costs. Government Accountability Office (GAO) reports from 2024 and 2025 have highlighted that lifetime sustainment costs for the program could reach approximately $1.58 trillion through 2088. As of late 2025, the annual sustainment cost per tail for the F-35A remains significantly above original targets, hovering between $6.6 million and $6.8 million.

Parallel to these sustainment efforts, Pratt & Whitney is executing a separate $1.3 billion contract for the F135 Engine Core Upgrade (ECU). This modernization effort aims to enhance the engine’s power and cooling capabilities to support “Block 4” weapons and sensors. The ECU is currently scheduled for fielding in 2029.

The newly announced sustainment contract serves as a bridge, ensuring the current fleet remains viable and combat-ready while the program navigates these future upgrades and cost-reduction initiatives.

Sources:

• RTX / Pratt & Whitney Press Release
• Government Accountability Office (GAO) Reports (Contextual Data)

Photo Credit: RTX