Keeping a 1960s airframe relevant in the 2050s has less to do with nostalgia than with wiring diagrams, test cards, and the unglamorous reality that engines wear out.
That is the context for the U.S. Air Force tasking Boeing under a more than $2 billion award to begin the first engine replacements on the B-52H Stratofortress. The work falls under the Commercial Engine Replacement Program (CERP) and directs Boeing to modify two aircraft with new engines and associated subsystems, then run an integration and test campaign intended to mature the design after the program’s critical design review. The depot-scale effort is spread across Boeing sites in Oklahoma City; San Antonio; Seattle; and Indianapolis, with completion projected by May 2033.
CERP sits inside a broader, unusually comprehensive modernization push that changes the aircraft’s identity as much as its components. The Air Force has said the scale of changes will be substantial enough that the upgraded jets will be redesignated B-52J. Alongside the engine swap, the bomber is slated for a modernized radar, avionics and communications upgrades, cockpit changes that move it away from analog instrumentation, and other hardware refreshes such as wheels and brakes. The stated aim is to keep 76 B-52s viable into at least the 2050s, with planning that can extend farther; if the jet approaches that horizon, the platform’s operational life would span close to a century.
What makes the engine decision structurally important is not simply thrust, but the cascading maintenance and sustainment consequences of retiring a powerplant family that has become difficult to support at scale. The B-52’s current Pratt & Whitney TF33 engines trace their design heritage to the 1950s, have been out of production for decades, and increasingly impose cost and availability penalties. CERP’s one-for-one approach replacing eight engines with eight new engines signals a preference for integration risk control: less airframe rework, fewer knock-on aerodynamic or structural surprises, and a clearer path through qualification.
The replacement is the Rolls-Royce F130, a military derivative of the BR725 line used on business aircraft, selected to deliver improved fuel efficiency and reduced maintenance burden. During the competition, Rolls-Royce described an approach centered on digital engineering to reduce integration risk We digitally integrated that engine into the pod, into the pylon, into the wing, and dynamically modeled the entire system of operation, said Tom Bell, the company’s North America president and CEO. He also described a guiding constraint: Frankly, the least amount of change, for the U.S. Air Force, would be better, from a risk standpoint.
Those digital methods matter because the B-52’s wing, pylons, and nacelles must accept a modern engine and its supporting systems without introducing new operational penalties. A re-engine program is rarely “just an engine.” Air Force contracting language associated with CERP points to kit-based installation that bundles supporting hardware struts, generators, hydraulic pumps, nacelles and fairings, cockpit panels, ducting, anti-ice components, and sensors illustrating how propulsion modernization becomes an aircraft-wide systems integration exercise. That is also why Boeing’s first two modified jets are a pivotal step: they are the integration proving ground that will shape production kits, depot workflow, and test requirements for the rest of the fleet.
In parallel, the B-52’s radar modernization is already moving hardware into the test enterprise. The first bomber fitted with the new AESA radar completed a ferry flight from Boeing’s San Antonio facility to Edwards Air Force Base, enabling a 2026 test program leading to a later production decision, according to the Air Force’s Dec. 10, 2025 release. Air Force leadership framed the radar as a readiness and longevity move rather than a boutique capability add. “The ferry flight of this upgraded B-52 marks an important moment in our efforts to modernize the bomber force,” Secretary of the Air Force Troy Meink said in that statement. Chief of Staff Gen. Kenneth S. Wilsbach added: “This milestone ensures our future Airmen inherit a modernized, ready Air Force.”
The new radar, designated AN/APQ-188, is intended to replace the legacy APQ-166, which the Air Force has characterized as antiquated and increasingly difficult to sustain. The modernization is expected to improve navigation and targeting performance across weather conditions, while also aligning the bomber’s sensor supportability with more modern maintenance concepts. For engineers and maintainers, the practical value is less about a single feature and more about the cumulative effect: fewer dead-end parts, fewer bespoke repair actions, and greater confidence that the aircraft’s sensor backbone can be supported through the same decades the airframe is expected to keep flying.
The modernization push also fits a larger force-design intent: over time, the Air Force aims to operate a two-bomber fleet built around B-52s and a B-21 force of at least 100 aircraft. As older platforms retire in the 2030s, the service is counting on the B-52J to remain a high-capacity, long-range contributor especially as a standoff weapons truck while the B-21 provides a different set of options. That division of labor makes the B-52’s engineering refresh less of a museum-grade restoration and more of an industrial bet that proven airframes can keep pace when propulsion, sensors, communications, and cockpit systems are rebuilt for modern operations.
For Boeing, CERP’s initial task order is the start of the most visible phase: cutting metal, routing harnesses, proving fit, and demonstrating that a new propulsion architecture can be integrated without breaking what already works. For the Air Force, it is the point where a program designed on paper begins the longer work of turning 76 aircraft into a repeatable modification line one that can keep the Stratofortress flying with credible performance, manageable sustainment, and a cockpit and sensor suite that no longer belongs to the era when the jet first entered service.
