{"id":8151921,"date":"2026-07-31T08:39:25","date_gmt":"2026-07-31T06:39:25","guid":{"rendered":"https:\/\/migflug.com\/jetflights\/air-india-ai171-fuel-control-switch-no-defect-thrust-module-2026\/"},"modified":"2026-07-31T08:39:52","modified_gmt":"2026-07-31T06:39:52","slug":"air-india-ai171-fuel-control-switch-no-defect-thrust-module-2026","status":"publish","type":"post","link":"https:\/\/migflug.com\/jetflights\/fr\/air-india-ai171-fuel-control-switch-no-defect-thrust-module-2026\/","title":{"rendered":"Air India&#8217;s Fuel Switch Passed Every Test"},"content":{"rendered":"<style>.et_pb_title_container h1.entry-title { padding-top: 40px !important; }<\/style><p>On 30 July 2026, India's government told Parliament something that, more than a year after the Air India 171 disaster, only makes the central mystery harder to solve: the Boeing 787's fuel control switches \u2014 the very components at the heart of the investigation \u2014 show no defect.<\/p><p>The finding matters because those two small switches are, so far, the only thing investigators know went wrong. On 12 June 2025, Air India flight AI171, a Boeing 787-8 registered VT-ANB, lifted off from Ahmedabad bound for London Gatwick and crashed roughly 32 seconds later into a medical-college hostel about 1.7 kilometres beyond the runway. Of the 242 people on board, 241 died; another 19 were killed on the ground. A single passenger survived.<\/p><p>The preliminary report established that, seconds after lift-off, both engine fuel control switches moved from RUN to CUTOFF, one after the other, starving both engines of fuel. Why they moved has never been explained. The latest testing rules out one answer \u2014 a faulty switch \u2014 without supplying another.<\/p>\r\n<div style=\"background:#f5f5f5;padding:20px 24px;margin:24px 0;border-radius:8px\"><p style=\"margin:0 0 10px;font-weight:700;font-size:17px;color:#222\">Informations cl\u00e9s<\/p><table style=\"width:100%;border-collapse:collapse;font-size:15px\"><tr><td style=\"padding:5px 10px 5px 0;color:#666;vertical-align:top;white-space:nowrap\"><strong>Vol<\/strong><\/td><td style=\"padding:5px 0\">Air India AI171, Ahmedabad to London Gatwick<\/td><\/tr><tr><td style=\"padding:5px 10px 5px 0;color:#666;vertical-align:top;white-space:nowrap\"><strong>A\u00e9ronef<\/strong><\/td><td style=\"padding:5px 0\">Boeing 787-8, VT-ANB (12 years old)<\/td><\/tr><tr><td style=\"padding:5px 10px 5px 0;color:#666;vertical-align:top;white-space:nowrap\"><strong>Date<\/strong><\/td><td style=\"padding:5px 0\">12 June 2025<\/td><\/tr><tr><td style=\"padding:5px 10px 5px 0;color:#666;vertical-align:top;white-space:nowrap\"><strong>Sonner<\/strong><\/td><td style=\"padding:5px 0\">260 killed, including 19 on the ground<\/td><\/tr><tr><td style=\"padding:5px 10px 5px 0;color:#666;vertical-align:top;white-space:nowrap\"><strong>Survivors<\/strong><\/td><td style=\"padding:5px 0\">1 of 242 on board<\/td><\/tr><tr><td style=\"padding:5px 10px 5px 0;color:#666;vertical-align:top;white-space:nowrap\"><strong>Core finding<\/strong><\/td><td style=\"padding:5px 0\">Both fuel switches moved RUN to CUTOFF seconds after take-off<\/td><\/tr><tr><td style=\"padding:5px 10px 5px 0;color:#666;vertical-align:top;white-space:nowrap\"><strong>New (July 2026)<\/strong><\/td><td style=\"padding:5px 0\">No defect found in the switch or its locking detents<\/td><\/tr><tr><td style=\"padding:5px 10px 5px 0;color:#666;vertical-align:top;white-space:nowrap\"><strong>Still open<\/strong><\/td><td style=\"padding:5px 0\">Thrust control module under examination at Boeing; cause not established<\/td><\/tr><\/table><\/div>\r\n<h2 style=\"padding-top:22px\">What the government said<\/h2><p>Speaking to Parliament, Deputy Civil Aviation Minister Murlidhar Mohol said that a detailed examination of the fuel control switch \u2014 including the structural integrity of its locking detents, the small catches meant to stop the switch being knocked out of position \u2014 had found no defect. The wider thrust control module, he added, is still being analysed at a Boeing facility, and investigators have not yet concluded why the switches moved.<\/p>\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img data-opt-id=1676405151  fetchpriority=\"high\" decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/ml5psubhxdln.i.optimole.com\/cb:o2zA.c8a5\/w:auto\/h:auto\/q:mauto\/ig:avif\/https:\/\/migflug.com\/jetflights\/wp-content\/uploads\/sites\/4\/2026\/07\/air-india-787-8-vt-anp.jpg\" alt=\"Air India Boeing 787-8 Dreamliner\" style=\"width:100%;height:auto;max-width:100%;display:block;border-radius:6px\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">An Air India Boeing 787-8 Dreamliner. The aircraft involved in the AI171 accident, VT-ANB, was a 12-year-old example of the type. Photo: Wikimedia Commons.<\/figcaption><\/figure>\r\n<h2 style=\"padding-top:22px\">How the investigation reached this point<\/h2><p>The AAIB's preliminary report, published in July 2025, laid out the sequence in stark terms. Within a second of each other, both fuel control switches transitioned from RUN to CUTOFF just after the aircraft left the ground. The switches were later returned to RUN, and the engines attempted to relight \u2014 but the aircraft was too low and too slow, and at least one engine could not recover thrust in time.<\/p><p>The cockpit voice recording captured a brief, haunting exchange: one pilot asked the other why he had moved the switches to cutoff; the other replied that he had not. The report stopped there. It did not establish why the switches moved, and it assigned blame to no one.<\/p>\r\n<div style=\"background:#f8f9fa;border-left:4px solid #555;padding:20px 22px;margin:18px 0 24px;border-radius:0 8px 8px 0;font-size:16px;line-height:1.7\"><em>&ldquo;At this stage of investigation, there are no recommended actions to B787-8 operators and engine manufacturers.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Aircraft Accident Investigation Bureau (AAIB), India<\/strong> &mdash; preliminary report, July 2025<\/div><\/div>\r\n\r\n<div style=\"max-width:550px;margin:0 auto 28px\"><iframe class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" src=\"https:\/\/platform.twitter.com\/embed\/Tweet.html?id=1933240865591370052&theme=light\" style=\"width:100%;height:520px;border:none;border-radius:12px;overflow:hidden\" allowfullscreen><\/iframe><\/div>\r\n<h2 style=\"padding-top:22px\">The locking-feature question<\/h2><p>There is a reason the locking detents are being scrutinised. Back in 2018, the U.S. Federal Aviation Administration issued an advisory bulletin flagging that the fuel-cutoff switch locking feature could, on some Boeing models including the 787-8, be installed in a way that left it disengaged. The bulletin was advisory rather than mandatory, and the recommended inspection was, by Air India's own account to investigators, not carried out on the accident aircraft.<\/p><p>That history is exactly why the July 2026 finding is significant. If the switch and its locking mechanism are sound, the \"the switch simply slipped\" explanation becomes harder to sustain \u2014 which pushes the inquiry deeper into the electronics and logic of the thrust control module now sitting on a bench at Boeing.<\/p><h2 style=\"padding-top:22px\">A careful, contested inquiry<\/h2><p>Investigators have broadly split into two readings. One looks for a technical trigger \u2014 an electrical fault that could have disturbed the aircraft's systems, with the switch movements a symptom rather than a deliberate act. The other reads the cockpit audio as evidence of a manual shutdown. No cause has been established, and Indian courts have been careful to stress that the preliminary report does not imply culpability on the part of the pilot-in-command.<\/p><p>More than a year on, the families are still waiting for the one thing the investigation cannot yet give them: a reason. The thrust control module now being examined at Boeing may hold it. Until then, the most honest summary is the uncomfortable one \u2014 the switches moved, and nobody has yet proven how.<\/p><p style=\"font-size:13px;color:#777;font-style:italic;margin-top:24px\">Sources: FlightGlobal; BusinessToday; The Air Current; Airways Magazine; Al Jazeera; Britannica.<\/p>\r\n<div style=\"background:#f0f4ff;border-left:4px solid #5C91FF;padding:16px 20px;margin:32px 0 8px;border-radius:0 8px 8px 0\"><p style=\"margin:0 0 8px;font-weight:600;color:#333\">Articles similaires<\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/jetflights\/air-india-171-one-year-aaib-interim-report-fuel-switch-mystery-2026\/\">Air India 171: One Year On, the Fuel-Switch Mystery<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/jetflights\/british-airways-a320-alternate-law-stall-heathrow-aaib-2026\/\">A Sensor Failure Stripped an A320's Stall Protection<\/a><\/p><\/div>","protected":false},"excerpt":{"rendered":"<p>On 30 July 2026, India&#8217;s government told Parliament something that, more than a year after the Air India 171 disaster, only makes the central mystery harder to solve: the Boeing 787&#8217;s fuel control switches \u2014 the very components at the heart of the investigation \u2014 show no defect. The finding matters because those two small [&hellip;]<\/p>\n","protected":false},"author":27,"featured_media":8151451,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"editor_notices":[],"footnotes":""},"categories":[665,670],"tags":[],"class_list":["post-8151921","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aviation-world","category-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Air India Fuel Switch: No Defect Found in AI171 Probe<\/title>\n<meta name=\"description\" content=\"India\u2019s government says the Air India fuel switch has no defect, deepening the mystery of why both engines lost fuel seconds after AI171 took off.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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