{"id":158521,"date":"2026-09-24T04:05:00","date_gmt":"2026-09-23T22:35:00","guid":{"rendered":"https:\/\/aviationa2z.com\/?p=158521"},"modified":"2026-09-23T22:38:54","modified_gmt":"2026-09-23T17:08:54","slug":"honeywell-targets-f-35-thermal-demands-with-p40-upgrade","status":"publish","type":"post","link":"https:\/\/aviationa2z.com\/index.php\/2026\/09\/24\/honeywell-targets-f-35-thermal-demands-with-p40-upgrade\/","title":{"rendered":"Most Advanced Fighter Jet in the World Gets Major Thermal Upgrade with New P40 System"},"content":{"rendered":"\n

PHOENIX- <\/strong>Honeywell Aerospace has introduced a new P40 upgrade for the F-35 Lightning II<\/a>\u2019s Power and Thermal Management System (PTMS), increasing cooling capacity from about 32 kilowatts to 40 kilowatts.<\/p>\n\n\n\n

The company says the upgrade will provide a 25% increase in cooling capacity while improving reliability and supporting the fighter\u2019s growing demand for thermal management.<\/p>\n\n\n\n

The upgrade comes as the F-35 receives more advanced sensors, mission systems and computing equipment that generate additional heat.<\/p>\n\n\n\n

Honeywell Aerospace says P40 can be integrated without airframe modifications and could be installed alongside the planned Engine Core Upgrade, allowing operators to add thermal capacity during scheduled maintenance.<\/p>\n\n\n\n

\"Honeywell
Photo: F-35 Lightning II<\/figcaption><\/figure>\n\n\n\n

F-35 Cooling Upgrade Boosts Thermal Capacity<\/h2>\n\n\n\n

The P40 package combines software improvements with targeted liquid-cooling enhancements within the existing PTMS architecture.<\/p>\n\n\n\n

Honeywell says the approach avoids the extensive redesign and integration work that would be required to replace the deeply integrated system with a completely new architecture.<\/p>\n\n\n\n

The company expects the technology to enter service between 2029 and 2030. That timeline would provide additional cooling capacity before a replacement PTMS architecture could be developed, qualified, and introduced across the F-35 fleet.<\/p>\n\n\n\n

Honeywell has designed the PTMS to perform several critical functions beyond thermal management. <\/p>\n\n\n\n

The system supports auxiliary and emergency power<\/a>, engine starting, environmental control and cooling for aircraft mission equipment, making it an important part of the F-35\u2019s overall systems architecture.<\/p>\n\n\n\n

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Photo: Julian Herzog, Wikimedia
<\/figcaption><\/figure>\n\n\n\n

PTMS Reliability Gains Across Fleet Operations<\/h2>\n\n\n\n

Honeywell says P40 also targets reliability issues identified through analysis of almost 1 million F-35 flight hours. <\/p>\n\n\n\n

The company has identified the causes of Honeywell-attributable non-resettable in-flight shutdowns and expects the corrective measures included in P40 to reduce such events by about 30%.<\/p>\n\n\n\n

The PTMS has already accumulated more than 1 million flight hours across the global F-35 fleet.<\/p>\n\n\n\n

Honeywell previously reported that the system had supported more than 1,100 F-35 aircraft, highlighting the scale of the existing architecture and its established support network.<\/p>\n\n\n\n

The upgrade is also intended to reduce maintenance<\/a> pressure while retaining the existing repair, tooling and technical-support infrastructure.<\/p>\n\n\n\n

Operators would therefore be able to expand cooling capability without establishing an entirely new sustainment system.<\/p>\n\n\n\n

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Photo: Wikimedia Commons<\/figcaption><\/figure>\n\n\n\n

Future F-35 Thermal Capacity For Modernization Needs<\/h2>\n\n\n\n

Honeywell describes P40 as an intermediate step toward higher cooling levels as the F-35 continues to receive new mission equipment. <\/p>\n\n\n\n

The company says the existing architecture can eventually support capacity increases to 62 kilowatts and beyond through phased upgrades.<\/p>\n\n\n\n

That scalability is significant because future F-35 modernization will continue to increase electrical and thermal demands.<\/p>\n\n\n\n

Honeywell has previously outlined upgrade paths that could push PTMS cooling capacity further while reusing much of the existing hardware and software, reducing the amount of new integration work required.<\/p>\n\n\n\n

The P40 upgrade therefore focuses on expanding the capabilities of an established F-35 system rather than replacing it entirely.<\/p>\n\n\n\n

Honeywell says this approach can preserve existing fleet investments while giving operators additional cooling capacity for future mission-system upgrades.<\/p>\n\n\n\n

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