What project 673510 buys
The Power Thermal Management Upgrade (PTMU) program will provide the required power and cooling upgrade to the current F-35 thermal management system to meet the estimates for a 5th Generation F-35 fighter. During development, air vehicle cooling requirements grew to exceed planned bleed air extraction. To provide the necessary bleed air, the engine was required to run hotter, and early engineering assessments indicate that this increase in operating temperature decreases engine life, resulting in earlier depot inductions and an increase in life cycle cost. Future capabilities and mission systems will be limited by PTMS cooling capacity. With threats continuing to develop, the F-35 requires new mission systems to out pace emerging threats to remain relevant and lethal. This upgrade may consist of modifications to the current Power Thermal Management System (PTMS), Fuel Thermal Management System (FTMS), and Electrical Power System (EPS). This work includes nonrecurring engineering for the development, test, and certification of the upgraded PTMS, FTMS, and EPS systems to ensure suitable cooling is available for future capacities. This program element included all necessary expenses required to manage, execute, and deliver weapon system capability. The use of such program funds would be in addition to the civilian pay expenses budgeted in program elements 0605829F, 0605831F, 0605833F, and 0605898F. Funding allocations at the project level have historically been subject to change due to the complexity of the F-35 budget structure and cost share ratios. The program will ensure any within-PE adjustments during execution year are reflected in future budget submissions. The FY2027 request includes $5,122 thousand of discretionary and $71,959 thousand of mandatory for a total of $77,081 thousand for acceleration of Engine and Power Thermal Management timelines.
- Product Development
Project 673510 funding, FY2025–FY2031
Prior years are actuals, the budget year is the request, and the outyears are the FYDP plan. Estimate types are colored and never summed into one figure. Projects carry the full five-year plan; the activities inside them stop at the budget year.
| Fiscal Year | Estimate Type | Amount ($M) |
|---|---|---|
| FY2025 | Actual | 19.3 |
| FY2026 | Enacted | 27.3 |
| FY2027 | Request | 5.1 |
| FY2028 | Outyear | 81.4 |
| FY2029 | Outyear | 133.2 |
| FY2030 | Outyear | 143.3 |
| FY2031 | Outyear | 126.5 |
1 accomplishment / planned program
The R-2A exhibit — the only level of the budget that describes work that has not happened yet. Activities carry the prior, current and budget year only, no five-year plan. Coverage is partial across the corpus, so count activities, never total them.
FY2027 planned work Continue non-recurring engineering efforts to refine detailed requirements and define preferred configurations to meet fleet cooling needs. Transition non-recurring engineering into preliminary design of the selected Thermal Management Systems. This work includes the necessary labor and non-recurring engineering to support preliminary design and development of an upgraded PTMS, FTMS, and EPS through efforts such as requirements development, trade studies, technology maturation, technical risk reduction activities, establishing a digital program infrastructure through modeling leading.
FY2026 to FY2027 change Increased funding in FY2027 is required to start the initial Preliminary Design of the preferred configuration which will be selected in early FY2027.
FY2026 plans — current year Continue non-recurring engineering effort to increase PTMS Upgrade cooling requirements and continued maturation of potential Thermal Management Systems (TMSs). This work includes the necessary labor and non-recurring engineering to support development of an upgraded PTMS, FTMS, and EPS through efforts such as requirements development, trade studies, technology maturation, technical risk reduction activities, and establishing a digital program infrastructure through modeling.
Named performers on project 673510
Performers named in the R-3 exhibit under this project. Share is of the project's whole FY2027 R-3 total — the same denominator the program-element split uses, so the two read on one scale and will not sum to 100% when unnamed or government work is in the mix. Budget-justification contract funding, not obligations.