# U.S. Air Force Modernizes B-52J Fleet

The U.S. Air Force has initiated a major modernization program for its B-52H Stratofortress bombers, redesignated as B-52J, involving the replacement of engines with Rolls-Royce F130 models and upgrades to the AN/APQ-188 AESA radar systems. Initial contracts exceeding $2.7 billion have been awarded to Boeing as the prime contractor, Rolls-Royce as the engine supplier, and Raytheon for radar system development. Prototype testing is underway at Edwards Air Force Base, California, with full fleet modernization planned through the early 2030s. This program offers substantial contracting opportunities in aircraft modification, engine manufacturing, radar technology, and related sustainment activities.

- The program includes a $2 billion contract awarded in December 2025 for modifying two B-52 bombers with new engines under the Commercial Engine Replacement Program.
- A $603 million IDIQ contract was awarded in 2026 for building and sustaining AN/APQ-188 AESA radars, alongside a $163 million order for updated bomb-rack hardware.
- Procurement professionals should note the multi-year scope and significant funding, indicating long-term opportunities for contractors specializing in aerospace systems and defense modernization.
- Companies involved in engine production, radar systems, and aircraft modifications should evaluate participation in upcoming solicitations and subcontracting possibilities tied to this modernization effort.

**Jurisdictions:** federal
**Industries:** Defense & Military
**Topics:** Physical Infrastructure
**Published:** September 25, 2026

### Government Entities
- U.S. Air Force (USAF)

### Vendors
- Boeing (prime contractor)
- Rolls-Royce (engine supplier)
- Raytheon (radar system contractor)

### Sources
- [U.S. Air Force Approves B-52J Engine Replacement and Radar Modernization - Overt Defense](https://www.overtdefense.com/2026/09/25/u-s-air-force-approves-b-52j-engine-replacement-and-radar-modernization) - Overt Defense -