{"id":187512,"date":"2025-04-16T06:47:06","date_gmt":"2025-04-16T06:47:06","guid":{"rendered":"https:\/\/peraltafinancing.com\/airline\/indonesia-airasia-flight-8501-air-transport-safety-articles-by-shem-malmquist\/"},"modified":"2025-04-16T06:47:06","modified_gmt":"2025-04-16T06:47:06","slug":"indonesia-airasia-flight-8501-air-transport-safety-articles-by-shem-malmquist","status":"publish","type":"post","link":"https:\/\/fivemor.com\/?p=187512","title":{"rendered":"Indonesia AirAsia Flight 8501 | Air Transport Safety Articles by Shem Malmquist"},"content":{"rendered":"<p> <br \/>\n<\/p>\n<div>\n<p><img decoding=\"async\" data-attachment-id=\"316\" data-permalink=\"https:\/\/airlinesafety.blog\/2015\/12\/03\/indonesia-airasia-flight-8501\/airasia\/\" data-orig-file=\"https:\/\/airlinesafety.blog\/wp-content\/uploads\/2015\/12\/airasia.jpg\" data-orig-size=\"1192,629\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;S Malmquist&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;1449141564&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"airasia\" data-image-description=\"\" data-image-caption=\"\" data-medium-file=\"https:\/\/airlinesafety.blog\/wp-content\/uploads\/2015\/12\/airasia.jpg?w=300\" data-large-file=\"https:\/\/airlinesafety.blog\/wp-content\/uploads\/2015\/12\/airasia.jpg?w=640\" class=\"alignnone size-full wp-image-316\" src=\"https:\/\/airlinesafety.blog\/wp-content\/uploads\/2015\/12\/airasia.jpg?w=640\" alt=\"airasia\" srcset=\"https:\/\/airlinesafety.blog\/wp-content\/uploads\/2015\/12\/airasia.jpg 1192w, https:\/\/airlinesafety.blog\/wp-content\/uploads\/2015\/12\/airasia.jpg?w=150&amp;h=79 150w, https:\/\/airlinesafety.blog\/wp-content\/uploads\/2015\/12\/airasia.jpg?w=300&amp;h=158 300w, https:\/\/airlinesafety.blog\/wp-content\/uploads\/2015\/12\/airasia.jpg?w=768&amp;h=405 768w, https:\/\/airlinesafety.blog\/wp-content\/uploads\/2015\/12\/airasia.jpg?w=1024&amp;h=540 1024w\" sizes=\"(max-width: 1192px) 100vw, 1192px\"\/><\/p>\n<p>The Final Report of the Air Asia 8501 has been released.\u00a0 This was a loss of control accident that does contain some lessons that are worthwhile sharing.<\/p>\n<p>There had been an ongoing maintenance item that resulted the ECAM message of a AUTO FLT RUD TRV LIM SYS.\u00a0 While it later turned out to be faulty wiring, their maintenance appeared to be\u00a0treating it each time as a \u201cone off\u201d type of event rather than a repetitive maintenance item.\u00a0 The maintenance procedures for a repetitive issue is often different than it would be for a single event.\u00a0 Those of us who fly \u201celectric jets\u201d know that having a temporary \u201cnuisance\u201d type of alert is not rare, we call them \u201cstray electrons\u201d and are often the result of a slightly delayed power transfer or similar.\u00a0 As a result they can often be fixed by just waiting a minute or, if that doesn\u2019t work, the system can be rebooted.\u00a0 These are issues common to any computer, whether it is your iPhone or an airplane.\u00a0 Of course, in the case of our airplanes there are many systems that are inter-related and so a momentary glitch in one system can lead a second system to not start up correctly, etc.<\/p>\n<p>The point here is that if it is a repetitive issue then it is likely a real fault of some sort and so when we write up a problem it is important to note that it is repetitive.\u00a0 Now most company computer systems will also be tracking these but by putting the words \u201crepeat item\u201d in the maintenance logbook we can reduce the chance that it will be overlooked and proper procedures applied.<\/p>\n<p>The next issue worthwhile looking at was what happened next.\u00a0 Apparently the Captain on this flight had seen this maintenance item before and was watching while a mechanic \u201cfixed\u201d the alert by pulling some circuit breakers for the Flight Augmentation Computers (FAC).\u00a0\u00a0 During the accident flight the alert appeared several times.\u00a0 Finally, after the fourth time, the Captain decided to pull those breakers inflight.\u00a0 This is not a book procedure and resulted in the flight control system reverting to alternate law and the autopilot disengaging. \u00a0Procedures published for system problems are carefully thought out and absent an extreme emergency there is no reason to deviate from the published procedures.<\/p>\n<p>The result of the alternate law resulted in the roll control on the control stick going from a rate command (you make an input and it sets a desired rate) to direct command (similar to a non-FBW airplane), while the pitch command remains in a mode pretty much similar to normal law without protections.\u00a0 This means that in pitch the command on the stick is a \u201cg\u201d command, in which a neutral stick is commanding 1 g which will mean it will not change its vertical velocity, but unlike normal law it will not prevent the aircraft from stalling.<\/p>\n<p>For reasons suspected to be distraction the first officer, who was flying, did not immediately notice that after autopilot disconnect the aircraft started to roll.\u00a0 When he did recognize it he started to recover with both a roll and an aft stick movement and rolled from a 54 degree left bank to 9 degrees in under 2 seconds.\u00a0 This might have created some other effects such as a vestibular illusion.\u00a0 Following this, like AF 447 it appears that the first officer had a difficult time keeping the wings level.\u00a0 This might seem surprising but remember that at FL 320 the aircraft was in a regime in terms of low air density that the first officer had likely never flown the aircraft, and, like AF 447, this was coupled with flying in a control law that was relatively unfamiliar.\u00a0 In multiple previous events of this nature it resulted in some challenge for the pilot to control the roll.<\/p>\n<p>The pull back is not explained but it may just be the nature of a rapid mechanical input where the hand moves to the right and back at the same time.\u00a0 In any event, it resulted in the aircraft to rapidly pitch up.\u00a0 From the reactions of the crew it appears that they were completely startled.\u00a0 One wonders if they thought they had some secondary flight control issue going on, as it is clear that there was some confusion.\u00a0 In any event, the aircraft progressed into a stall and aft stick position was maintained as the angle of attack increased to extreme values.\u00a0 The communication between them was in English, which was neither of the pilots first language, and that might have contributed to the confusion.\u00a0 For reasons unknown the Captain did not authoritively take command of the airplane and it appears that neither pilot recognized the stall.\u00a0 For discussion on that, <a href=\"https:\/\/airlinesafety.wordpress.com\/2015\/04\/07\/high-altitude-stalls-how-well-do-you-understand-them\/\">see my previous article.<\/a><\/p>\n<p>It should also be noted that the aircraft descent rate became extreme and so was going to be much less than 1 g, let alone the higher g-demand that was being commanded by the aft stick pull. \u00a0The aircraft elevators will work to try to maintain the g-demand so even with the stick neutral if the aircraft is experiencing less than 1-g then the elevator will try to pitch to hold that 1-g. \u00a0Also, it should be noted that pushing forward on controls when at half a g or less requires overcoming a lot of natural human response.<\/p>\n<p>One more note is that the Captain of this flight had considerable aerobatic and hands on flying as a military pilot so those that believe that more of that type of flying would prevent such accidents need to reconsider.\u00a0 Clearly training is necessary and it is also clear that the industry has not addressed these issues satisfactorily at this time.<\/p>\n<p>===============================================<\/p>\n<p><a href=\"https:\/\/airlinesafety.blog\/angle-of-attack-book\/\"><img decoding=\"async\" data-attachment-id=\"659\" data-permalink=\"https:\/\/airlinesafety.blog\/2012\/02\/02\/inflight-fire\/aoa-book-image1\/\" data-orig-file=\"https:\/\/airlinesafety.blog\/wp-content\/uploads\/2012\/02\/aoa-book-image1.jpg\" data-orig-size=\"395,522\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;S Malmquist&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;1501688080&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"aoa-book-image1\" data-image-description=\"\" data-image-caption=\"\" data-medium-file=\"https:\/\/airlinesafety.blog\/wp-content\/uploads\/2012\/02\/aoa-book-image1.jpg?w=227\" data-large-file=\"https:\/\/airlinesafety.blog\/wp-content\/uploads\/2012\/02\/aoa-book-image1.jpg?w=395\" class=\"alignnone size-full wp-image-659\" src=\"https:\/\/airlinesafety.blog\/wp-content\/uploads\/2012\/02\/aoa-book-image1.jpg?w=640\" alt=\"aoa-book-image1\" srcset=\"https:\/\/airlinesafety.blog\/wp-content\/uploads\/2012\/02\/aoa-book-image1.jpg 395w, https:\/\/airlinesafety.blog\/wp-content\/uploads\/2012\/02\/aoa-book-image1.jpg?w=114&amp;h=150 114w, https:\/\/airlinesafety.blog\/wp-content\/uploads\/2012\/02\/aoa-book-image1.jpg?w=227&amp;h=300 227w\" sizes=\"(max-width: 395px) 100vw, 395px\"\/><\/a><\/p>\n<p><span id=\"wordads-inline-marker\" style=\"display: none;\"\/>\t\t\t<\/p><\/div>\n<div id=\"entry-author-info\">\n<div id=\"author-avatar\">\n\t\t\t\t\t\t\t<img alt=\"\" src=\"https:\/\/1.gravatar.com\/avatar\/71222e839936336880e5ead5cc76aa2fcca467386a8082d8acec7a434b719bca?s=60&amp;d=identicon&amp;r=G\" srcset=\"https:\/\/1.gravatar.com\/avatar\/71222e839936336880e5ead5cc76aa2fcca467386a8082d8acec7a434b719bca?s=60&amp;d=identicon&amp;r=G 1x, https:\/\/1.gravatar.com\/avatar\/71222e839936336880e5ead5cc76aa2fcca467386a8082d8acec7a434b719bca?s=90&amp;d=identicon&amp;r=G 1.5x, https:\/\/1.gravatar.com\/avatar\/71222e839936336880e5ead5cc76aa2fcca467386a8082d8acec7a434b719bca?s=120&amp;d=identicon&amp;r=G 2x, https:\/\/1.gravatar.com\/avatar\/71222e839936336880e5ead5cc76aa2fcca467386a8082d8acec7a434b719bca?s=180&amp;d=identicon&amp;r=G 3x, https:\/\/1.gravatar.com\/avatar\/71222e839936336880e5ead5cc76aa2fcca467386a8082d8acec7a434b719bca?s=240&amp;d=identicon&amp;r=G 4x\" class=\"avatar avatar-60\" height=\"60\" width=\"60\" loading=\"lazy\" decoding=\"async\"\/>\t\t\t\t\t\t<\/div>\n<p><!-- #author-avatar --><\/p>\n<div id=\"author-description\">\n<h2>\n\t\t\t\t\t\t\tAbout Shem Malmquist FRAeS\t\t\t\t\t\t\t<\/h2>\n<p>\t\t\t\t\t\t\tB-777 Captain.  Air Safety and Accident Investigator.  Previous experience includes Flight Operations management, Assistant Chief Pilot. Line Check Airman, ALPA Aircraft Technical and Engineering Chairman, Aircraft Performance and Designs Committee MEC Chair, Charting and Instrument Procedures Committee, Group Leader-Commercial Aviation Safety Team-Joint Safety Implementation Team (CAST)-Loss of Control-Human Factors and Automation, CAST-JSIT- Aircraft State Awareness. Fellow of the Royal Aeronautical Society, full Member of ISASI, AIAA, IEEE, HFES, FSF, AFA and the Resilience Engineering Association.  I am available for consulting, speaking or providing training seminars to your organization.  Please contact me at https:\/\/malmquistsafety.com\/for inquiries.\t\t\t\t\t\t\t<!-- #author-link\t-->\n\t\t\t\t\t\t<\/div>\n<p><!-- #author-description -->\n\t\t\t\t\t<\/div>\n\n","protected":false},"excerpt":{"rendered":"<p>The Final Report of the Air Asia 8501 has been released.\u00a0 This was a loss of control accident that does contain some lessons that are worthwhile sharing. There had been an ongoing maintenance item that resulted the ECAM message of a AUTO FLT RUD TRV LIM SYS.\u00a0 While it later turned out to be faulty [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":187513,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12028],"tags":[2236,53908,13532,2364,28297,29562,417,29561,5625],"dealstore":[],"offerexpiration":[],"class_list":["post-187512","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-airline","tag-air","tag-airasia","tag-articles","tag-flight","tag-indonesia","tag-malmquist","tag-safety","tag-shem","tag-transport"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Indonesia AirAsia Flight 8501 | Air Transport Safety Articles by Shem Malmquist - Som2ny Network<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/fivemor.com\/?p=187512\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Indonesia AirAsia Flight 8501 | Air Transport Safety Articles by Shem Malmquist - Som2ny Network\" \/>\n<meta property=\"og:description\" content=\"The Final Report of the Air Asia 8501 has been released.\u00a0 This was a loss of control accident that does contain some lessons that are worthwhile sharing. 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