{"id":20662710,"date":"2026-09-06T20:00:15","date_gmt":"2026-09-06T18:00:15","guid":{"rendered":"https:\/\/migflug.com\/afterburner\/air-india-a320neo-triple-hydraulic-failure-aaib-preliminary-report\/"},"modified":"2026-09-06T20:00:37","modified_gmt":"2026-09-06T18:00:37","slug":"air-india-a320neo-triple-hydraulic-failure-aaib-preliminary-report","status":"publish","type":"post","link":"https:\/\/migflug.com\/afterburner\/air-india-a320neo-triple-hydraulic-failure-aaib-preliminary-report\/","title":{"rendered":"Air India A320neo Lost All Three Hydraulic Systems at 36,000 Feet"},"content":{"rendered":"<style>.et_pb_title_container h1.entry-title { padding-top: 40px !important; }<\/style>\r\n\r\n<p>The Airbus A320 has three hydraulic systems, and they are separate on purpose. Green, blue and yellow. Three reservoirs, three pressure sources, no fluid shared between them. The architecture exists so that no single failure can take away the flight controls.<\/p>\r\n\r\n<p>On 4 August 2026, at 36,000 feet over eastern India, an Air India A320neo lost all three of them in four seconds.<\/p>\r\n\r\n<p>India&rsquo;s Aircraft Accident Investigation Bureau published its preliminary report into the event this week. It answers a great deal about what happened, and almost nothing about why.<\/p>\r\n\r\n\r\n<div style=\"background:#f5f5f5;padding:20px;margin:24px 0;font-size:15px;line-height:1.7\"><p style=\"margin:0 0 10px;font-weight:700;font-size:17px\">Quick Facts<\/p><p style=\"margin:4px 0\"><strong>Flight:<\/strong> Air India AI2379, Phuket (VTSP) to Delhi (VIDP)<\/p><p style=\"margin:4px 0\"><strong>Aircraft:<\/strong> Airbus A320-251N, registration VT-EXO, LEAP-1A26 engines, 26,837 hours total<\/p><p style=\"margin:4px 0\"><strong>Date:<\/strong> 4 August 2026, around 04:02 UTC (09:32 IST), in the cruise at FL360<\/p><p style=\"margin:4px 0\"><strong>On board:<\/strong> 145 &mdash; 137 passengers, 6 cabin crew, 2 pilots<\/p><p style=\"margin:4px 0\"><strong>Event:<\/strong> Green, blue and yellow hydraulic systems all lost pressure within four seconds; autopilot dropped out; two-second stall warning<\/p><p style=\"margin:4px 0\"><strong>Excursion:<\/strong> Climbed 372 ft above FL360, then descended 292 ft below it<\/p><p style=\"margin:4px 0\"><strong>Injuries:<\/strong> 24 treated (20 passengers, 4 cabin crew); 4 hospitalised with serious injuries<\/p><p style=\"margin:4px 0\"><strong>Outcome:<\/strong> All three systems recovered within seconds; flight continued to Delhi, landing at 05:30 UTC<\/p><p style=\"margin:4px 0\"><strong>Status:<\/strong> Initially notified as turbulence, later reclassified as an accident. Investigation ongoing.<\/p><\/div>\r\n\r\n\r\n<h2 style=\"padding-top:22px\">Four seconds<\/h2>\r\n\r\n<p>The timeline in the AAIB report is unusually tight. At 04:02:43 UTC the flight control system registered low pressure in the green system. Four seconds later the blue and the yellow systems went too. At 04:02:48 the autopilot disengaged. At 04:02:51 a stall warning sounded for two seconds.<\/p>\r\n\r\n<p>The co-pilot was the pilot flying and responded first; the captain then took over the controls. The aircraft gained 372 feet above its assigned FL360 and then dropped 292 feet below it &mdash; a total vertical excursion of 664 feet.<\/p>\r\n\r\n<p>Then it fixed itself. At around 04:02:52 the blue system came back, followed within seconds by yellow and green, and the flight control surfaces were restored. From first indication to full recovery the whole event lasted well under half a minute.<\/p>\r\n\r\n<p>The aircraft&rsquo;s Post Flight Report logged the sequence in the order it happened: HYD GREEN SYS LO PR, followed by blue and yellow, then AUTO FLT AP OFF, then FLT CTL L, R ELEVATOR FAULT, then low-level warnings on the yellow and blue reservoirs.<\/p>\r\n\r\n\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img data-opt-id=902854160  fetchpriority=\"high\" decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/ml5psubhxdln.i.optimole.com\/cb:0e0_.b970\/w:auto\/h:auto\/q:mauto\/ig:avif\/https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/09\/air-india-a320-251n-vt-exi-dhaka.jpg\" alt=\"An Air India Airbus A320-251N at Dhaka\" 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 Air India Airbus A320-251N, the same sub-type as VT-EXO. The three hydraulic systems on an A320 supply 3,000 psi and share no fluid with one another. Photo: Md Shaifuzzaman Ayon \/ Wikimedia Commons, CC BY-SA 4.0<\/figcaption><\/figure>\r\n\r\n\r\n<h2 style=\"padding-top:22px\">Why it should not be possible<\/h2>\r\n\r\n<p>The AAIB spells out the architecture in the report, and it is worth reading twice. The three systems supply 3,000 psi to the main users. Hydraulic fluid cannot be transferred from one system to another. Each system has its own reservoir. The green system&rsquo;s normal pressure source is the engine-driven pump on the left engine.<\/p>\r\n\r\n<p>In other words, three independent circuits, each with its own fluid, dropped pressure inside four seconds and then all recovered. That is not a leak. A leak drains one reservoir and stays drained.<\/p>\r\n\r\n<p>One detail the report records without drawing any conclusion from it: the aircraft was dispatched from Phuket under a Minimum Equipment List item, number 29-23-01A, covering the Power Transfer Unit, invoked on 28 July 2026. The PTU is an auxiliary pressure source that can pressurise the green or yellow system from the other, without transferring fluid, and it kicks in automatically when there is a 500 psi difference between them. The AAIB notes the deferred item. It does not link it to the pressure losses.<\/p>\r\n\r\n<p>Hydraulic components and fluid samples have been removed for testing. A team of Airbus technical experts, working through the French BEA as the accredited representative of the state of design, inspected the aircraft in India from 13 to 15 August. Both flight recorders have been downloaded.<\/p>\r\n\r\n<h2 style=\"padding-top:22px\">What 664 feet does to a cabin<\/h2>\r\n\r\n<p>The seat belt signs were off. That single fact is the difference between an alarming technical event and an accident with hospitalisations.<\/p>\r\n\r\n<p>The damage list in the report reads like a demolition inventory. Overhead ceiling panels cracked or deformed at the 5th, 9th, 10th, 11th, 18th, 19th and 20th rows. Passenger service unit panels dislocated or bent. An overhead handrail broken near row 10. The forward right emergency exit handle broken. Overhead bin doors torn off their hinges at rows 20 and 25. A crew seat bent. And, memorably, the commode in lavatory E uprooted from its mounting.<\/p>\r\n\r\n<p>Twenty-four people needed medical attention on arrival. Twenty were discharged after treatment for minor injuries. Four had serious injuries and were admitted to hospital.<\/p>\r\n\r\n<p>The crew assessed the cabin, decided against diverting, requested medical priority from Delhi ATC and landed on runway 11L at 05:30 UTC, taxiing to the stand under the aircraft&rsquo;s own power. Neither the crew nor air traffic control reported adverse weather. The occurrence had initially been notified to the AAIB as a turbulence encounter; the investigators reclassified it as an accident after seeing the injuries.<\/p>\r\n\r\n<h2 style=\"padding-top:22px\">The other finding<\/h2>\r\n\r\n<p>Because AI2379 originated outside India, both pilots were subject to a post-flight medical on arrival under DGCA rules. The breath analyser results were satisfactory for both.<\/p>\r\n\r\n<p>The psychoactive substance screening was not. The captain&rsquo;s sample came back non-negative on the detection kit, and a confirmatory blood test at a pathology laboratory returned the same result. The co-pilot was negative in both. The report does not identify the substance.<\/p>\r\n\r\n\r\n<div style=\"background:#f8f9fa;border-left:4px solid #d32f2f;padding:20px 22px;margin:18px 0 24px;font-size:16px;line-height:1.7;display:flex;gap:20px;align-items:flex-start\"><div><em>&ldquo;The confirmation of use of psycho-active substance is a serious concern and AAIB recommends appropriate actions by DGCA on priority.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>India&rsquo;s Aircraft Accident Investigation Bureau<\/strong> &mdash; Preliminary Report, accident to VT-EXO, published September 2026<\/div><\/div><\/div>\r\n\r\n<p>Air India terminated the captain&rsquo;s employment with immediate effect on 4 September, hours after the report appeared.<\/p>\r\n\r\n<p>It is worth being precise about what this does and does not mean. The AAIB draws no link between the test result and the hydraulic failure, and the report is explicit that its purpose is prevention rather than blame. A drug test result does not explain three independent hydraulic circuits losing pressure simultaneously and then recovering. That question is still open.<\/p>\r\n\r\n\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img data-opt-id=255245155  fetchpriority=\"high\" decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/ml5psubhxdln.i.optimole.com\/cb:0e0_.b970\/w:auto\/h:auto\/q:mauto\/ig:avif\/https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/09\/air-india-airbus-a320-251n-vt-exg-approach.jpg\" alt=\"An Air India Airbus A320-251N on approach\" 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\">Air India operates a large A320neo fleet. The investigation into VT-EXO continues, with the final report to follow. Photo: Anna Zvereva \/ Wikimedia Commons, CC BY-SA 2.0<\/figcaption><\/figure>\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\/z7DPAZ0qsnM\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\r\n\r\n<p style=\"font-size:13px;color:#777;text-align:center;font-style:italic\">Indian broadcast coverage of the AAIB preliminary report into flight AI2379.<\/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:\"\u2013\"}.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 happened on Air India flight AI2379?<\/summary><div class=\"a\">On 4 August 2026 an Airbus A320-251N registered VT-EXO, flying from Phuket to Delhi with 145 people on board, lost pressure in all three hydraulic systems within four seconds while cruising at FL360. The autopilot disengaged, a stall warning sounded for two seconds and the aircraft climbed 372 feet then descended 292 feet from its assigned level. All three systems recovered within seconds and the flight landed safely in Delhi.<\/div><\/details><details><summary>How many hydraulic systems does an Airbus A320 have?<\/summary><div class=\"a\">Three, identified by colour as green, blue and yellow. Together they supply hydraulic power at 3,000 psi. Each system has its own reservoir and fluid cannot be transferred between them, which is why the simultaneous loss of all three on VT-EXO is so unusual. The Power Transfer Unit can pressurise green from yellow or yellow from green, but it moves pressure, not fluid.<\/div><\/details><details><summary>How many people were injured on Air India AI2379?<\/summary><div class=\"a\">Twenty-four people received medical attention on arrival in Delhi: 20 passengers and four cabin crew. Twenty were discharged after treatment for minor injuries and four with serious injuries were hospitalised. The seat belt signs were off at the time of the upset, which is why the injuries occurred despite a vertical excursion of only around 664 feet.<\/div><\/details><details><summary>Did the Air India captain fail a drug test?<\/summary><div class=\"a\">The AAIB preliminary report states that the pilot-in-command returned a non-negative result on a psychoactive substance detection kit and that a confirmatory blood test at a pathology laboratory was also non-negative. The co-pilot tested negative in both. The report does not identify the substance. Air India terminated the captain with immediate effect on 4 September 2026.<\/div><\/details><details><summary>Did the drug test result cause the hydraulic failure?<\/summary><div class=\"a\">No connection has been established. The AAIB draws no link between the captain test result and the loss of hydraulic pressure, and it issued the finding as a separate interim safety recommendation to India regulator, the DGCA. The technical cause of the triple hydraulic loss remains unexplained, with components and fluid samples still under laboratory analysis.<\/div><\/details><details><summary>Why was the AI2379 event reclassified from turbulence to an accident?<\/summary><div class=\"a\">The AAIB was initially notified by Airports Authority of India that the aircraft had encountered turbulence en route and that some people on board were injured. After collecting evidence at Delhi and assessing the severity of the injuries, investigators reclassified the occurrence as an accident. Neither the flight crew nor air traffic control had reported adverse weather.<\/div><\/details><details><summary>What damage did the Air India A320neo sustain?<\/summary><div class=\"a\">All the damage was inside the cabin. The AAIB lists cracked or deformed ceiling panels across seven rows, dislocated passenger service unit panels, two broken overhead handrails, a broken forward right emergency exit handle, overhead bin doors detached from their hinges at rows 20 and 25, a bent crew seat, severely broken door ceiling panels and a lavatory commode uprooted from its mounting.<\/div><\/details><\/div><\/section>\r\n\r\n\r\n\r\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What happened on Air India flight AI2379?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"On 4 August 2026 an Airbus A320-251N registered VT-EXO, flying from Phuket to Delhi with 145 people on board, lost pressure in all three hydraulic systems within four seconds while cruising at FL360. The autopilot disengaged, a stall warning sounded for two seconds and the aircraft climbed 372 feet then descended 292 feet from its assigned level. All three systems recovered within seconds and the flight landed safely in Delhi.\"}},{\"@type\":\"Question\",\"name\":\"How many hydraulic systems does an Airbus A320 have?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Three, identified by colour as green, blue and yellow. Together they supply hydraulic power at 3,000 psi. Each system has its own reservoir and fluid cannot be transferred between them, which is why the simultaneous loss of all three on VT-EXO is so unusual. The Power Transfer Unit can pressurise green from yellow or yellow from green, but it moves pressure, not fluid.\"}},{\"@type\":\"Question\",\"name\":\"How many people were injured on Air India AI2379?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Twenty-four people received medical attention on arrival in Delhi: 20 passengers and four cabin crew. Twenty were discharged after treatment for minor injuries and four with serious injuries were hospitalised. The seat belt signs were off at the time of the upset, which is why the injuries occurred despite a vertical excursion of only around 664 feet.\"}},{\"@type\":\"Question\",\"name\":\"Did the Air India captain fail a drug test?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The AAIB preliminary report states that the pilot-in-command returned a non-negative result on a psychoactive substance detection kit and that a confirmatory blood test at a pathology laboratory was also non-negative. The co-pilot tested negative in both. The report does not identify the substance. Air India terminated the captain with immediate effect on 4 September 2026.\"}},{\"@type\":\"Question\",\"name\":\"Did the drug test result cause the hydraulic failure?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No connection has been established. The AAIB draws no link between the captain test result and the loss of hydraulic pressure, and it issued the finding as a separate interim safety recommendation to India regulator, the DGCA. The technical cause of the triple hydraulic loss remains unexplained, with components and fluid samples still under laboratory analysis.\"}},{\"@type\":\"Question\",\"name\":\"Why was the AI2379 event reclassified from turbulence to an accident?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The AAIB was initially notified by Airports Authority of India that the aircraft had encountered turbulence en route and that some people on board were injured. After collecting evidence at Delhi and assessing the severity of the injuries, investigators reclassified the occurrence as an accident. Neither the flight crew nor air traffic control had reported adverse weather.\"}},{\"@type\":\"Question\",\"name\":\"What damage did the Air India A320neo sustain?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"All the damage was inside the cabin. The AAIB lists cracked or deformed ceiling panels across seven rows, dislocated passenger service unit panels, two broken overhead handrails, a broken forward right emergency exit handle, overhead bin doors detached from their hinges at rows 20 and 25, a bent crew seat, severely broken door ceiling panels and a lavatory commode uprooted from its mounting.\"}}]}<\/script><p><em>Sources: Aircraft Accident Investigation Bureau (India) Preliminary Report on VT-EXO; AeroTime; FlightGlobal; The Tribune.<\/em><\/p>\r\n\r\n\r\n<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\/united-232-the-dc-10-that-landed-with-no-hydraulics\/\">United 232: The DC-10 That Landed With No Hydraulics<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/air-india-ai171-fuel-control-switch-no-defect-thrust-module-2026\/\">Air India&rsquo;s Fuel Switch Passed Every Test<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/dhl-a300-baghdad-missile-hydraulics-2003\/\">Hit by a Missile, Landed on Engines Alone<\/a><\/p><\/div>\r\n\r\n","protected":false},"excerpt":{"rendered":"<p>India&rsquo;s AAIB has published its preliminary report into Air India AI2379, which lost green, blue and yellow hydraulic pressure in four seconds at FL360.<\/p>\n","protected":false},"author":23,"featured_media":20662435,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"editor_notices":[],"footnotes":""},"categories":[665,670],"tags":[],"class_list":["post-20662710","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 v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Air India A320neo Triple Hydraulic Failure at 36,000 Feet | MiGFlug<\/title>\n<meta name=\"description\" content=\"India AAIB report on Air India AI2379: a triple hydraulic failure at FL360 injured 24 people. 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