PTMS Upgrade
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. Engine Core Upgrade funding and requirements are transferring from Utility Subsystem Support PU 0358 into Propulsion PU 2556 to properly align Engine Modernization Efforts.
Document Details
- Document Type
- Accomplishment
- Publication Date
- Oct 01, 2025
- Source ID
- ab3cf66a44894e587fd2c726e8d30fa0
Related Documents
- Root: F-35C C2D2