"get[ting] ready for potential integration activities in the 2030 timeframe," John Sneden said.
Speaking at the Life Cycle Industry Days conference in Dayton, Ohio, Sneden — the chief of the Air Force’s propulsion directorate — delivered a compact timetable for the Next Generation Adaptive Propulsion (NGAP) program: after years of delay, the Air Force now expects a next‑generation engine will be ready to be put on an aircraft by the end of the decade. But the service stopped short of naming a platform for that engine, and emphasized the work ahead will determine the options available.
John Sneden and the propulsion directorate's framing
Sneden repeatedly framed NGAP as both a near‑term engineering campaign and a longer‑range enabler. He told reporters the Air Force is “still evaluating its options,” and described NGAP as “really a host of technologies” that could be integrated backward into current designs as well as forward into future aircraft. He acknowledged the program’s delays and said the current phase of the effort is focused on building “our system today, and we’re getting ready for the future.”
Competition: GE Aerospace vs. Pratt & Whitney
The service plans to build and test competing prototypes from GE Aerospace and Pratt & Whitney over the next few years. Sneden attributed roughly three years of cumulative delay on NGAP in part to the choice to pursue a two‑vendor competition on a limited budget. The competition is intended to mature “adaptive” turbofan technologies — engines that can change characteristics in flight to trade between fuel efficiency and thrust — and culminate in demonstrators that support integration planning around 2030.
Integration choices and the F-47 question
While NGAP was originally envisioned to provide a powerplant for the Air Force’s Next Generation Air Dominance fighter, now dubbed the F‑47, Sneden would not commit to placing the new engine on any particular platform. He said a new NGAP engine “could” go on the F‑47, but that no decisions have been made. The reporting notes the F‑47 is slated to fly sometime during the current Trump administration and that it is therefore unlikely to sport an NGAP engine in the near term — though a later update is possible depending on the aircraft’s design.
Budget trajectory: $514 million in FY27, peaking near $906 million in FY28
The NGAP effort coincides with a cresting budget request. Air Force budget documents show a roughly $514 million request for NGAP in fiscal 2027, rising to nearly $906 million in FY28. Program officials described NGAP as a multibillion‑dollar effort that could represent a significant leap in military propulsion if the adaptive technologies mature as intended.
F-35 Engine Core Upgrade: Pratt contract, CDR next month, flight testing by 2030
Separately, Sneden confirmed an upgrade to the F‑35’s engine — the Engine Core Upgrade (ECU) — is expected to be ready for flight testing “in the 2030 timeframe.” The ECU program is contracted to Pratt and is expected to clear a critical design review next month. A Government Accountability Office report previously found that the upgraded engine would not be in production until at least 2031.
What this means for GE Aerospace, Pratt & Whitney, and Air Force propulsion planners
- GE Aerospace and Pratt & Whitney: Both vendors face near‑term pressure to deliver competing NGAP prototypes for testing. The program’s limited budget and the stated three‑year cumulative delay create incentives to meet milestones that will enable integration planning around 2030.
- The Air Force propulsion directorate and planners: The directorate must balance competition, a peaking NGAP budget in FY28, and integration choices that could be applied both backward to legacy platforms and forward to new airframes such as the F‑47. Sneden signaled the service is deliberately keeping platform decisions open while the technology is matured.
- F‑35 program and Pratt’s ECU work: Pratt is managing concurrent responsibilities — the NGAP competition and the Engine Core Upgrade for the F‑35 — with the ECU moving toward a critical design review next month and flight testing expected in the 2030 timeframe, though production is not expected until at least 2031 per the GAO.
The Air Force has drawn a line in the calendar: build and test competitor NGAP demonstrators in the coming years, and prepare for integration activity around 2030. The details that will determine which airframes, if any, receive an NGAP engine remain in play; the immediate checkpoints are the competing prototype tests, the NGAP budget trajectory through FY28, and the upcoming critical design review for the F‑35 Engine Core Upgrade.
