{"id":1668616,"date":"2026-06-10T15:15:16","date_gmt":"2026-06-10T13:15:16","guid":{"rendered":"https:\/\/migflug.com\/jetflights\/?p=1668616"},"modified":"2026-06-10T15:46:13","modified_gmt":"2026-06-10T13:46:13","slug":"de-havilland-comet-metal-fatigue-square-windows-investigation-1954","status":"publish","type":"post","link":"https:\/\/migflug.com\/jetflights\/de-havilland-comet-metal-fatigue-square-windows-investigation-1954\/","title":{"rendered":"The de Havilland Comet: The Beautiful Jet That Taught Us How Aircraft Break"},"content":{"rendered":"<style>.et_pb_title_container h1.entry-title { padding-top: 40px !important; }<\/style>\n\nThe de Havilland Comet was the most beautiful airliner ever built. It was also the most deadly \u2014 and its failures saved more lives than any single aircraft in history.\n\n<em>We&#8217;ve written about the Comet before \u2014 see our <a href=\"https:\/\/migflug.com\/jetflights\/de-havilland-comet-first-jet-airliner-metal-fatigue-square-windows\/\" target=\"_blank\">earlier piece<\/a> on its legacy. This article focuses on the investigation that changed aviation forever.<\/em>\n\nWhen the Comet 1 entered service with BOAC on May 2, 1952, it was a revolution. Passengers stepped aboard an aircraft that flew twice as fast, twice as high, and infinitely smoother than any propeller-driven airliner. The cabin was pressurised to a comfortable altitude. The engines \u2014 four de Havilland Ghost turbojets buried in the wing roots \u2014 were virtually vibration-free compared to piston engines. For the first time, crossing the Atlantic felt like the future.\n\nThen the future started falling out of the sky.\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\"><iframe width=\"700\" height=\"394\" src=\"https:\/\/www.youtube.com\/embed\/v0Cg2ZeYa5E\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe><\/div><figcaption>Why You Wouldn&rsquo;t Want to Fly The First Jet Airliner &mdash; Mustard (6.4 million views)<\/figcaption><\/figure>\n<h2 style=\"padding-top:22px\">Three Comets Lost<\/h2>\n\nOn January 10, 1954, BOAC Flight 781 disintegrated at 29,000 feet shortly after takeoff from Rome. All 35 people aboard were killed. The wreckage fell into the Mediterranean near the island of Elba.\n\nThe Comet fleet was grounded. Engineers inspected every airframe, found nothing conclusive, and returned the type to service. Fifteen days later, on April 8, 1954, South African Airways Flight 201 \u2014 a BOAC-operated Comet \u2014 broke apart at altitude near Naples. Twenty-one dead. The Comet was grounded permanently.\n\nA third Comet had already been lost: BOAC Flight 783 crashed on takeoff from Calcutta in May 1953 during a violent storm, but this was attributed to structural overload in turbulence \u2014 a design problem, but a different one.\n\n\n<div style=\"background:#f0f4ff;border:1px solid #dbe4ff;border-radius:8px;padding:18px 22px;margin:18px 0 24px\">\n<p style=\"margin:0 0 10px;font-weight:700;color:#333;font-size:17px\">The Comet Crashes<\/p>\n<ul style=\"margin:0;padding-left:18px;color:#444;line-height:1.8\">\n<li><strong>BOAC Flight 783:<\/strong> 2 May 1953, Calcutta \u2014 43 killed (structural failure in storm)<\/li>\n<li><strong>BOAC Flight 781:<\/strong> 10 Jan 1954, Mediterranean near Elba \u2014 35 killed (metal fatigue)<\/li>\n<li><strong>SAA Flight 201:<\/strong> 8 Apr 1954, Mediterranean near Naples \u2014 21 killed (metal fatigue)<\/li>\n<\/ul>\n<\/div>\n\n\n\n<blockquote style=\"border-left:4px solid #0073aa;padding:15px 20px;margin:20px 0;background:#f8f9fa;font-size:1.1em;\"><em>&ldquo;The Comet disasters led to the most important and far-reaching investigation in aviation history. Every modern airliner flies more safely because the Comet failed first.&rdquo;<\/em><br><strong>&mdash; Royal Aeronautical Society, on the legacy of the Comet investigations<\/strong><\/blockquote>\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\"><iframe width=\"700\" height=\"394\" src=\"https:\/\/www.youtube.com\/embed\/-DjnG74DDno\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe><\/div><figcaption>YOU have Misunderstood The De Havilland Comet. It Wasn&rsquo;t the Windows! &mdash; Mentour Now! (649K views)<\/figcaption><\/figure>\n<h2 style=\"padding-top:22px\">The Investigation That Changed Everything<\/h2>\n\nThe Royal Aircraft Establishment at Farnborough launched the most thorough accident investigation the world had ever seen. Engineers recovered wreckage from the Mediterranean seabed \u2014 a pioneering underwater salvage operation \u2014 and painstakingly reconstructed the fuselage of Flight 781.\n\nThen they did something no one had attempted before. They took a complete Comet fuselage, placed it in a water tank, and subjected it to repeated pressurisation cycles \u2014 inflating and deflating the cabin thousands of times to simulate years of service.\n\nAfter the equivalent of 3,060 flights, the fuselage burst.\n\nThe crack originated at the corner of a square window \u2014 specifically, at a rivet hole near the automatic direction finder (ADF) antenna cutout in the roof. Under repeated pressurisation loads, microscopic cracks formed at stress concentration points around the square-cornered openings. After roughly 1,000 flight cycles, these cracks propagated through the skin until the fuselage failed catastrophically.\n\n\n<blockquote class=\"reddit-embed-bq\" data-embed-height=\"316\"><a href=\"https:\/\/reddit.com\/r\/todayilearned\/comments\/s3r08h\/\">TIL the world&rsquo;s first commercial jet airliner, the De Havilland Comet, suffered numerous fatal crashes in the 50&rsquo;s because the windows were square<\/a><\/blockquote><script async src=\"https:\/\/embed.reddit.com\/widgets.js\"><\/script><h2 style=\"padding-top:22px\">Square Windows Kill<\/h2>\n\nThe discovery was devastating in its simplicity. Square corners concentrate stress. Round corners distribute it. Every subsequent airliner \u2014 without exception \u2014 has used oval or round passenger windows. The Comet&#8217;s square windows were not the only factor (the fuselage skin was also thinner than it should have been, and the rivet holes created additional stress risers), but they became the iconic lesson.\n\nMore broadly, the Comet investigation established the discipline of metal fatigue analysis in aviation. Before the Comet crashes, fatigue was poorly understood and rarely tested. After them, every aircraft manufacturer was required to demonstrate that their designs could withstand tens of thousands of pressurisation cycles without failure. The fail-safe design philosophy \u2014 build structures so that a crack in one element does not cause catastrophic failure \u2014 became standard.\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\"><iframe width=\"700\" height=\"394\" src=\"https:\/\/www.youtube.com\/embed\/YVvKk-rGJME\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe><\/div><figcaption>A Brief History of: The de Havilland Comet Design Disaster &mdash; Plainly Difficult (530K views)<\/figcaption><\/figure>\n\n<blockquote class=\"twitter-tweet\"><a href=\"https:\/\/x.com\/clark_aviation\/status\/2008427562049900621\"><\/a><\/blockquote><script async src=\"https:\/\/platform.twitter.com\/widgets.js\"><\/script><h2 style=\"padding-top:22px\">The Bitter Irony<\/h2>\n\nDe Havilland redesigned the Comet with oval windows, thicker skin, and structural improvements. The Comet 4 entered service in 1958 and was perfectly safe. But it was too late. Boeing had used the years of the Comet&#8217;s grounding to develop the 707, which was bigger, faster, and more economical. The 707 defined the jet age. The Comet, which should have owned it, became a footnote.\n\nThe Comet killed 99 people in two crashes. The investigation it triggered has saved hundreds of thousands. No airliner since has suffered a pressurisation-fatigue failure of the kind that destroyed Flights 781 and 201.\n\nThat is the Comet&#8217;s true legacy: the beautiful jet that taught the world how aircraft actually break.\n\n\n<blockquote style=\"border-left:4px solid #0073aa;padding:15px 20px;margin:20px 0;background:#f8f9fa;font-size:1.1em;\"><em>&ldquo;The Comet was a beautiful aircraft. It was smooth, quiet, and fast. Passengers loved it. But it was built at the very edge of what metallurgy understood, and the edge was not far enough.&rdquo;<\/em><br><strong>&mdash; Bill Withers, de Havilland test engineer<\/strong><\/blockquote>\n<em>Sources: FAA Lessons Learned, RAF Museum, Admiral Cloudberg, Plane and Pilot, New Atlas<\/em>","protected":false},"excerpt":{"rendered":"<p>The de Havilland Comet was the most beautiful airliner ever built. It was also the most deadly \u2014 and its failures saved more lives than any single aircraft in history. We&#8217;ve written about the Comet before \u2014 see our earlier piece on its legacy. This article focuses on the investigation that changed aviation forever. When [&hellip;]<\/p>\n","protected":false},"author":27,"featured_media":1668573,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","editor_notices":[],"footnotes":""},"categories":[665,666],"tags":[],"class_list":["post-1668616","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aviation-world","category-history-and-legends"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>De Havilland Comet: How Square Windows Killed the First Jet Airliner | MiGFlug<\/title>\n<meta name=\"description\" content=\"The de Havilland Comet was the world&#039;s first jet airliner \u2014 and its crashes from metal fatigue rewrote aviation safety forever. 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