Replace the vulnerable parts of a ’50s-era bomber and convert it into a missile truck fit for 2050s. This is what lies behind the United States Air Force’s ambitious plans regarding its fleet of B-52J bombers. Now, with a critical design review successfully completed, the service can start to implement this program and move from concept studies toward actual conversion of two B-52Hs. They will be fitted with new components and sent to Edwards Air Force Base for thorough ground and flight testing. At least in Air Force jargon, this is the point at which an outdated airframe stops being an idea and starts evolving into something functional and useful.
And what are the major parts of this evolution? Of course, these include the one-for-one exchange of eight TF33 engines for eight Rolls-Royce F130s. The reason for this is both practical and technical. The former refers to the fact that the TF33 has been discontinued back in 1985 and the service has been reaching the point when the sustainment of such powerplants becomes more difficult than developing new engines. As far as their characteristics go, the F130 offers increased fuel efficiency and reliability, besides its lower maintenance requirement compared to the earlier type.
Of course, the engine change is a complex undertaking itself. It requires the installation of larger nacelles, redesigned struts and generators, modifications of pneumatic systems, anti-icing gear, cockpit panels and power distribution. This, in turn, means that the B-52J should be regarded as a fundamentally new airframe and not just as an upgraded bomber.
This is also reflected in the fact that wind-tunnel testing and engine-airframe integration got so much attention. Based on Boeing’s analysis, new nacelles would create slightly different aerodynamics since they would be located somewhat closer to the wing. In general, Pentagon’s test requirements cover several important aspects, including the airframe’s structural integrity, flutter, propulsion compatibility and flying qualities. Engines, though, cannot be regarded as a key element of the whole concept.
Indeed, the B-52’s importance lies in the fact that it does not have to perform the same missions as a fifth-generation stealth bomber. Instead, the B-21 Raider is expected to penetrate enemy territory, while the B-52J will support long-range strike with cruise and hypersonic missiles from outside that area. This implies that the bomber should be able to perform a specific function namely carrying a heavy payload and delivering it efficiently from standoff positions, while remaining hard to detect and shoot down.
The radar upgrade is yet another important aspect of the modernization program. In 2025, the Air Force transported one bomber equipped with a new AESA radar to Edwards AFB. Tests will commence in 2026, with the aim to replace the existing mechanically scanned set. According to reports, the new radar would offer better situational awareness, resistance to countermeasures and flexibility of long-range missions. Apart from that, other systems crew cabin, avionics, and communications will also be upgraded.
It should be kept in mind, though, that the current time frame foresees IOC in 2033, with the conversion of all planes expected to drag on until the mid-2030s. Nevertheless, as the Air Force believes, replacing outdated equipment on an already tested bomber is faster and easier than developing another long-range strategic strike platform from the scratch. If the plan goes as scheduled, individual B-52J bombers would serve up to a hundred years.