{"id":22969275,"date":"2026-09-17T10:41:03","date_gmt":"2026-09-17T08:41:03","guid":{"rendered":"https:\/\/migflug.com\/afterburner\/f135-engine-core-upgrade-risk-reduction-design-review-2026\/"},"modified":"2026-09-17T10:41:31","modified_gmt":"2026-09-17T08:41:31","slug":"f135-engine-core-upgrade-risk-reduction-design-review-2026","status":"publish","type":"post","link":"https:\/\/migflug.com\/afterburner\/fr\/f135-engine-core-upgrade-risk-reduction-design-review-2026\/","title":{"rendered":"F135 Engine Core Upgrade Clears Its Design Review"},"content":{"rendered":"<style>.et_pb_title_container h1.entry-title { padding-top: 40px !important; }<\/style>\r\n\r\n<p>The <a href=\"https:\/\/migflug.com\/aircraft\/f-35-lightning-ii\/\">F-35<\/a>\u2019s problem was never thrust. It was electricity, and the heat that comes with it.<\/p>\r\n\r\n<p>On 15 September 2026, Pratt &amp; Whitney announced from East Hartford that it had completed the Risk Reduction Design Review for the F135 Engine Core Upgrade &mdash; the milestone that certifies the design is mature enough to start heading toward production. It is the most concrete thing to happen to the programme in months, and it is the quiet precondition for almost everything the F-35 is supposed to do next.<\/p>\r\n\r\n\r\n<div style=\"background:#f5f6f8;border-left:4px solid #5C91FF;padding:18px 22px;margin:26px 0\"><p style=\"margin:0 0 10px;font-weight:700;font-size:17px;color:#0d1117\">Quick Facts<\/p><p style=\"margin:4px 0;font-size:15px\"><strong>Milestone:<\/strong> Risk Reduction Design Review (RRDR) completed<\/p><p style=\"margin:4px 0;font-size:15px\"><strong>Announced:<\/strong> 15 September 2026, East Hartford, Connecticut<\/p><p style=\"margin:4px 0;font-size:15px\"><strong>What ECU is:<\/strong> A drop-in core upgrade to the existing F135, not a new engine<\/p><p style=\"margin:4px 0;font-size:15px\"><strong>Applies to:<\/strong> All three F-35 variants, new-build and retrofit<\/p><p style=\"margin:4px 0;font-size:15px\"><strong>Retrofit route:<\/strong> Incorporated at production, or fitted at F135 depot facilities<\/p><p style=\"margin:4px 0;font-size:15px\"><strong>F135 fleet:<\/strong> More than 1,500 production engines delivered across 20 allied nations<\/p><p style=\"margin:4px 0;font-size:15px\"><strong>Purpose:<\/strong> Full engine life, plus the power and thermal management for Block 4 and beyond<\/p><\/div>\r\n\r\n\r\n<h2 style=\"padding-top:22px\">Why the engine had to change<\/h2>\r\n\r\n<p>Every new capability bolted onto the F-35 &mdash; better radar modes, new sensors, more processing, more weapons &mdash; costs electrical power and produces waste heat. On a stealth aircraft you cannot simply cut a hole and let the heat out, because holes are what radar sees. The heat goes into the fuel, and the fuel goes into the engine.<\/p>\r\n\r\n<p>Run that loop harder than it was designed for and you do not get a warning light. You get engines wearing out early. That has been the quiet cost of the F-35\u2019s growth for years, and it is the reason the Pentagon had to choose a propulsion path at all.<\/p>\r\n\r\n<p>It chose this one in March 2023. The alternative was the Adaptive Engine Transition Program &mdash; a genuinely new engine, technically impressive, and expensive. The deciding argument was not performance. It was that the adaptive engine suited the F-35A, would not fit the F-35B, and would fit the F-35C only with difficulty. The ECU was the cheapest option that worked for everybody. Congress fully funded it in the FY2024 appropriations to move into detailed design.<\/p>\r\n\r\n\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/09\/f-35-f135-engine-test-cell-aedc.jpg\" alt=\"An F-35 F135 engine installed in a test cell at the Arnold Engineering Development Complex\" style=\"width:100%;height:auto;max-width:100%;display:block\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">An F135 installed in a test cell at the Arnold Engineering Development Complex. The ECU keeps this architecture and changes the core. US Air Force photo<\/figcaption><\/figure>\r\n\r\n\r\n<h2 style=\"padding-top:22px\">What the review actually covered<\/h2>\r\n\r\n<p>An RRDR is not a ribbon-cutting. Pratt says the review went through the detailed design elements, the propulsion technologies, the integration questions and the risk-reduction work needed to deliver full engine life and the extra power and thermal capacity that Block 4 and beyond demand, across all three variants.<\/p>\r\n\r\n<p>It also did something less glamorous and arguably more important: it assessed whether the industrial base is ready to build and retrofit the thing. Given what senior acquisition officials have been saying this same week about capacity across American defence manufacturing, that line is not boilerplate.<\/p>\r\n\r\n\r\n<div style=\"background:#f8f9fa;border-left:4px solid #5C91FF;padding:20px 22px;margin:18px 0 24px;font-size:16px;line-height:1.7\"><em>&ldquo;Completing RRDR is an important milestone that demonstrates the maturity of the F135 Engine Core Upgrade and the progress our team is making to deliver this capability to the warfighter. As the selected propulsion modernization solution for the F-35, ECU builds on the proven F135 architecture to enable the power and thermal management needed for future capabilities, while leveraging an established global production and sustainment enterprise.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Jill Albertelli<\/strong> &mdash; president, Pratt &amp; Whitney Military Engines, 15 September 2026<\/div><\/div>\r\n\r\n\r\n<p>The government side was, if anything, warmer.<\/p>\r\n\r\n\r\n<div style=\"background:#f8f9fa;border-left:4px solid #1565c0;padding:20px 22px;margin:18px 0 24px;font-size:16px;line-height:1.7\"><em>&ldquo;The Risk Reduction Design Review highlighted strong collaboration among our industry and government team, demonstrating a mature ECU design. The ECU program remains on track to deliver substantially improved readiness and to support F-35 modernization to outpace our adversaries.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Capt. Mitch Grant, US Navy<\/strong> &mdash; F-35 Propulsion Program Manager, 15 September 2026<\/div><\/div>\r\n\r\n\r\n\r\n<div style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;margin:24px 0\"><iframe class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" src=\"https:\/\/www.youtube.com\/embed\/feip4lx26dQ\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\r\n\r\n\r\n<p>The F135 as it exists today: roughly 43,000 lb of thrust in afterburner, which puts it among the most powerful fighter engines ever fielded. Power was never the shortfall.<\/p>\r\n\r\n<h2 style=\"padding-top:22px\">The half of the problem the engine does not solve<\/h2>\r\n\r\n<p>ECU is one of two pieces. The other is the aircraft\u2019s power and thermal management system, where Collins Aerospace and Honeywell have been <a href=\"https:\/\/migflug.com\/afterburner\/f-35-cooling-epacs-collins-honeywell-2026\/\">competing over the enhanced cooling package<\/a>. Reporting on the combined effect of the upgraded core and the new cooling system points to something in the order of a 7 percent gain in range and thrust and roughly double the cooling capacity &mdash; figures that come from the manufacturers rather than from an independent test report, and should be read accordingly.<\/p>\r\n\r\n<p>The commercial logic behind the whole approach is the retrofit. Because ECU is a drop-in that keeps high commonality with the existing engine, it can go into new aircraft on the line or into fielded ones at a depot. With more than 1,500 F135s already delivered to twenty allied air arms, an upgrade that does not require a new engine bay is worth a great deal more than one that does.<\/p>\r\n\r\n<p>None of which has been flown yet. A design review validates a design; it does not validate an engine. But after a decade in which the F-35\u2019s propulsion story has been mostly about arguments and delays, a programme milestone landing where it was supposed to is its own kind of news.<\/p>\r\n\r\n<p><em>Sources: RTX \/ Pratt &amp; Whitney; US Department of the Navy; Air &amp; Space Forces Magazine; Defense News; The Aviationist.<\/em><\/p>\r\n\r\n\r\n<style>.mfq{margin:34px 0 8px}.mfq h2{font:26px\/1.3 \"Gilroy semiBold\",Helvetica,Arial,sans-serif;color:#0d1117;padding-top:22px;margin:0 0 6px}.mfq .qa details{border-top:1px solid #5C91FF;margin:0;padding:0}.mfq .qa details:last-of-type{border-bottom:1px solid #e2e7ee}.mfq .qa summary{cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:16px;padding:22px 26px;font:18px\/1.7 \"Gilroy semiBold\",Helvetica,Arial,sans-serif;color:#0d1117}.mfq .qa summary::-webkit-details-marker{display:none}.mfq .qa summary::after{content:\"+\";font:24px Helvetica,sans-serif;color:#3568e0;flex:0 0 auto}.mfq .qa details[open] summary::after{content:\"\\2013\"}.mfq .qa details:hover summary{color:#3568e0}.mfq .qa .a{font:16px\/1.7 \"Gilroy regular\",Helvetica,Arial,sans-serif;color:#454e5e;padding:0 26px 24px}.mfq .qa .a a{color:#3568e0}@media(max-width:680px){.mfq .qa summary{padding:18px 14px;font-size:17px}.mfq .qa .a{padding:0 14px 20px}}<\/style>\r\n\r\n\r\n<section class=\"mfq\"><h2>Frequently Asked Questions<\/h2><div class=\"qa\"><details open><summary>What is the F135 Engine Core Upgrade?<\/summary><div class=\"a\">The ECU is a modernisation of the existing Pratt &amp; Whitney F135 that powers the F-35. Rather than a new engine, it upgrades the core while keeping high commonality with the current design, delivering full engine life plus additional electrical power and thermal management capacity for future capabilities.<\/div><\/details><details><summary>What did the Risk Reduction Design Review confirm?<\/summary><div class=\"a\">Announced on 15 September 2026, the review validated the maturity of the ECU design and advanced the programme toward production. It covered detailed design elements, propulsion technologies, integration considerations and risk-reduction work, and also assessed industrial base readiness for production and retrofit.<\/div><\/details><details><summary>Why does the F-35 need more engine power?<\/summary><div class=\"a\">New sensors, processing and weapons all draw electrical power and generate waste heat. On a stealth aircraft that heat cannot simply be vented, so it is absorbed by the fuel and passed to the engine. Running that loop beyond its design point wears engines out early.<\/div><\/details><details><summary>Why was the adaptive engine rejected for the F-35?<\/summary><div class=\"a\">The Pentagon chose the F135 core upgrade in March 2023. The Adaptive Engine Transition Program engine suited the F-35A but would not fit the F-35B and would fit the F-35C only with difficulty, and it cost considerably more. The ECU was the lowest-cost option applicable to all three variants.<\/div><\/details><details><summary>Can existing F-35s receive the Engine Core Upgrade?<\/summary><div class=\"a\">Yes. The ECU is designed as a drop-in upgrade for both new-production and fielded aircraft. It can be incorporated on the production line or retrofitted at F135 depot facilities, which is central to its business case given the size of the installed fleet.<\/div><\/details><details><summary>How many F135 engines have been built?<\/summary><div class=\"a\">Pratt &amp; Whitney says it has delivered more than 1,500 F135 production engines to a worldwide customer base spanning 20 allied nations. That installed base is why a retrofittable upgrade was preferred to an entirely new engine design.<\/div><\/details><details><summary>How much extra performance will the upgrade give?<\/summary><div class=\"a\">Manufacturer figures reported alongside the enhanced power and cooling system suggest around a 7 percent increase in range and thrust and roughly twice the cooling capacity. These are company figures rather than independently verified test results and should be treated as such.<\/div><\/details><details><summary>Can civilians fly in a fighter jet?<\/summary><div class=\"a\">Not an F-35, but genuine fast-jet flights are available to civilians in types such as the MiG-29, L-39 Albatros and Hawker Hunter, including supersonic and edge-of-space sorties. MiGFlug arranges them; current types and prices are on the <a href=\"https:\/\/migflug.com\/flights-prices\/\">flights and prices page<\/a>.<\/div><\/details><\/div><\/section>\r\n\r\n\r\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What is the F135 Engine Core Upgrade?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The ECU is a modernisation of the existing Pratt & Whitney F135 that powers the F-35. 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MiGFlug arranges them; current types and prices are on the flights and prices page.\"}}]}<\/script><div style=\"background:#f0f4ff;border-left:4px solid #5C91FF;padding:16px 20px;margin:32px 0 8px\"><p style=\"margin:0 0 8px;font-weight:600;color:#333\">Related Posts<\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/f-35-cooling-epacs-collins-honeywell-2026\/\">Cooling the F-35: Collins&rsquo; EPACS Challenges Honeywell<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/f-35-block-4-upgrade-delays-2026\/\">The F-35&rsquo;s Killer Upgrade Keeps Slipping<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/f-35-readiness-epic-fury-mission-capable-rates-2026\/\">F-35 Readiness in Epic Fury: The Mission-Capable Numbers<\/a><\/p><\/div>\r\n","protected":false},"excerpt":{"rendered":"<p>The F-35&rsquo;s problem was never thrust. It was electricity and the heat that comes with it. Pratt &amp; Whitney has now cleared the design review that lets the fix head toward production.<\/p>","protected":false},"author":23,"featured_media":22968804,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"editor_notices":[],"footnotes":""},"categories":[664,670],"tags":[],"class_list":["post-22969275","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-military-aviation","category-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>F135 Engine Core Upgrade Clears Design Review | MiGFlug<\/title>\n<meta name=\"description\" content=\"Pratt &amp; Whitney has completed the F135 Engine Core Upgrade risk reduction design review, the milestone that unlocks F-35 Block 4 power and cooling.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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