Next Generation Adaptive Propulsion

The Next Generation Adaptive Propulsion (NGAP) program, under Program Element PE 0604010F, is a major Air Force research, development, test, and evaluation (RDT&E) effort focused on advancing adaptive engine technology for future military aircraft. The program's primary goal is to design, prototype, and test embedded adaptive propulsion systems that combine the fuel efficiency of commercial high-bypass turbofan engines with the high-performance capabilities required for military fighter engines. This initiative is managed by the Air Force Life Cycle Management Center, Propulsion Directorate, at Wright-Patterson Air Force Base, Ohio, and leverages advanced materials, manufacturing processes, and digital engineering matured under the previous Adaptive Engine Transition Program (AETP).

The objectives of the NGAP program are specific and multifaceted. It aims to validate the performance and maturity of adaptive propulsion technologies through the design, fabrication, and testing of multiple engine prototypes. These prototypes are intended to be platform-agnostic, supporting both augmented fighter aircraft and non-augmented mission aircraft across various operational scenarios.

By improving fuel efficiency, the program seeks to reduce energy demand and aerial tanker dependency, thereby increasing aircraft range and time on station. In peacetime, these improvements are expected to yield cost savings and increased aircrew readiness due to reduced fuel requirements.

NGAP detailed design and prototyping activities are carried out by several major contractors, including General Electric, Pratt & Whitney, Boeing, Lockheed Martin, and Northrop Grumman. These contractors were awarded indefinite delivery, indefinite quantity (IDIQ) contracts to complete prototype detailed design, fabrication, assembly, and testing. The acquisition strategy emphasizes competitive delivery orders for each program phase, with contractor performance determining progression. This approach enhances acquisition agility and allows for efficient allocation of resources based on available funding and program needs.

During FY 2025, both General Electric and Pratt & Whitney successfully completed digital detailed design reviews of their prototype engine designs, and delivery orders for prototype fabrication and assembly activities were awarded. Contractors are currently procuring materials, fabricating components, conducting component rig tests, and planning for assembly. In FY 2026, the program will continue prototype fabrication, component rig testing, and assembly planning, along with conducting assembly readiness reviews to assess contractor preparedness and test risk. Preparations for formal test readiness reviews will also be completed, ensuring that prototype engines are ready for comprehensive performance assessments at sea-level, altitude, and across multiple power settings.

Program management support is another critical component of the NGAP budget line, with dedicated funding for management services to oversee program execution, contractor coordination, and delivery of weapon system capability. Civilian pay expenses are included to support the necessary workforce for program management, with expenditures forecasted to increase slightly in FY 2025 to ensure adequate oversight and delivery of program milestones.

The NGAP program also drives digital transformation within the propulsion industrial base, aiming to reduce future integration risks and shorten development timelines. By advancing model-based manufacturing processes and digital weapon system integration activities, the program seeks to facilitate technology transition and improve affordability, reliability, and sustainment of future propulsion systems. The deliverables include detailed engine design parameters, matured technologies, engine hardware, rig assessment data, and studies on technology, affordability, and sustainment.