Utility and Subsystem Support to Mission Systems

Abstract

Current Mission System planning estimates due to Block 4 capabilities and beyond indicate that additional cooling is required for aircraft beginning in Lot 22 (FY28). This upgrade/modification consists of an upgrade to the current Honeywell PTMS that includes larger heat exchangers, shifting some systems from the cold liquid loop to the hot liquid loop, increasing system pressure, increasing pump speeds and raising compressor discharge temperatures. This modification upgrades components that are relatively low cost and already at a high technical readiness level. All PTMS changes for this level of cooling would be accomplished within the existing PTMS bay and there are not expected to be any necessary changes to the capacity of the cold liquid loop or the hot liquid loop. This work includes nonrecurring engineering for the development, test, and certification of the upgraded PTMS system to ensure suitable cooling is available for future capacities. The Government has assessed that EMD phase would take 5-6 years. Due to the massive leap in cooling and power needed to support post 2029 mission system upgrades on the F-35 the existing PTMS will need to either be massively upgraded or replaced. During multiple iterations of market research, it is clear that industry is capable of manufacturing a TMS that meets the F-35's cooling and power demands. However, it is unclear which system will be best. Therefor during the initial part of the program, the multiple potential solutions will be matured and then the prime integrator will down select to the system that best meets the Government's cost, schedule, and performance needs. This program element may include necessary civilian pay 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 element 0605827F, 0605828F, 0605829F, 0605831F, 0605832F, 0605833F, 0605898F, 0606398F. In FY23, $63.6M was expended for civilian pay expenses in this project element, and in FY24, $67.1M is forecasted for civilian pay expenses in this project element.

Document Details

• Document Type: Project
• Publication Date: Oct 01, 2025
• Source ID: 673510_0604840F_7_3600_PB_2025

Tags

Readers

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