{"id":4132,"date":"2019-05-20T20:32:06","date_gmt":"2019-05-21T01:32:06","guid":{"rendered":"https:\/\/doctoraviation.com\/?p=4132"},"modified":"2019-05-20T20:42:16","modified_gmt":"2019-05-21T01:42:16","slug":"the-latest-on-the-boeing-737-max","status":"publish","type":"post","link":"https:\/\/doctoraviation.com\/the-latest-on-the-boeing-737-max\/","title":{"rendered":"The Latest on the Boeing 737 Max"},"content":{"rendered":"\n<p>In March of 2019, the Boeing 737 Max dominated the\nnews headlines.&nbsp; This is the latest on\nthe Boeing 737 Max.&nbsp; Each bullet is\ndesigned to give a summary<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The Plane<\/h3>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"alignright\"><img loading=\"lazy\" decoding=\"async\" width=\"271\" height=\"186\" src=\"https:\/\/doctoraviation.com\/wp-content\/uploads\/2019\/05\/737-Max.jpg\" alt=\"\" class=\"wp-image-4126\"\/><figcaption>737 Max<\/figcaption><\/figure><\/div>\n\n\n\n<p>The Boeing 737 Max is the latest edition of one of Boeing\u2019s\nmost popular airliners.&nbsp; The 737 debuted\nin 1968.&nbsp; Bolstered by the success of\nSouthwest Airlines and its exclusive Boeing 737 fleet, the 737 has gone through\nseveral revisions.&nbsp; As a popular car is\nrefined over the years, so has the 737 over its history.&nbsp; The 737 Max is the latest production\nmodel.&nbsp; It debuted in 2017 and was\ndesigned with fuel economy in mind.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The Crashes<\/h3>\n\n\n\n<p>A Lion Air Boeing 737 Max crashed in Indonesia in October of 2018.&nbsp; This was followed by an Ethiopian Air crash in March 2019.&nbsp; The second crash led to the grounding of the fleet by one country, then another.&nbsp; It culminated in a grounding in the United States (directed by President Donald Trump to the FAA).&nbsp; Doctor Aviation commented on the decision (see <a href=\"https:\/\/doctoraviation.com\/doctor-aviation-discusses-grounding-of-boeing-737-max-on-wdtn\/\">Interview<\/a>).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The Cause<\/h3>\n\n\n\n<p>The two crashes led to intense scrutiny of the cause\nof the accidents.&nbsp; It usually takes up to\none year for a final crash investigation report to be issued.&nbsp; Therefore, there are no final reports for\neither accident.&nbsp; Initial reports have\nindicated a problem with the AOA system and the MCAS.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">AOA<\/h3>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"alignleft is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/doctoraviation.com\/wp-content\/uploads\/2019\/05\/AOA-e1558400160936.jpg\" alt=\"\" class=\"wp-image-4127\" width=\"327\" height=\"101\"\/><figcaption>AOA Illustrated<\/figcaption><\/figure><\/div>\n\n\n\n<p>AOA stands for Angle of Attack.&nbsp; This can be thought of as the angle of the\nwing in relation to the air flowing over the wing.&nbsp; There is an ideal AOA for an aircraft as it\nclimbs out and as it conducts an approach and landing.&nbsp; It can be thought of as a \u201csweet spot\u201d.&nbsp; The angle can be a little high or a little\nlow without incident.&nbsp; However, if the\nAOA becomes too high, a stall can result.&nbsp;\n<\/p>\n\n\n\n<p>Aircraft can vary as to the number of AOA sensors on a single aircraft.&nbsp; There are two AOA sensors on the 737 Max.&nbsp; These sensors send information to the pilots\u2019 instruments and the aircraft control systems. See this <a href=\"https:\/\/www.cnn.com\/2019\/05\/13\/business\/boeing-737-max-global-approval\/index.html\">Clip<\/a> for more information on AOA<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">MCAS<\/h3>\n\n\n\n<p>MCAS stands for Maneuvering Characteristics Augmentation System.&nbsp; This is a system that is designed to aid the pilot.&nbsp; Taking inputs from several flight instruments, the MCAS can direct flight control inputs if it deems the aircraft is in danger.&nbsp; For an excellent article and pictures of the system, see the following link: <a href=\"https:\/\/theaircurrent.com\/aviation-safety\/what-is-the-boeing-737-max-maneuvering-characteristics-augmentation-system-mcas-jt610\/\">MCAS<\/a><\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"alignright is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/doctoraviation.com\/wp-content\/uploads\/2019\/05\/Yoke-e1558400219415.png\" alt=\"\" class=\"wp-image-4131\" width=\"266\" height=\"159\"\/><figcaption>Aircraft Yoke<\/figcaption><\/figure><\/div>\n\n\n\n<p>In the case of the ill-fated flights, it seems that one AOA sensor was sending faulty signals to the MCAS.&nbsp; The MCAS determined that the aircraft was in danger of stalling.&nbsp; The MCAS then began to push the yoke (equivalent of the steering wheel) forward in order to avoid a stall.&nbsp; The problem lies in the fact that the aircraft was climbing out and was therefore not high in the air.&nbsp; When the yoke was pushed forward the aircraft began to descend towards the ground.&nbsp; The pilots in turn began to pull the yoke back to raise the nose, resulting in a \u201ctug of war\u201d with the MCAS.&nbsp; In the following clip from the <a href=\"https:\/\/www.bbc.com\/news\/av\/business-47816384\/a-pilot-explains-the-boeing-737-max-s-anti-stall-system\">BBC<\/a>, a pilot demonstrates the MCAS stall system in a simulator.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The Decision-Making Process<\/h3>\n\n\n\n<p>The Boeing Company and the FAA now have a challenge to restore the public\u2019s perception of the Boeing 737 Max.&nbsp; The Boeing Company released this <a href=\"https:\/\/www.boeing.com\/commercial\/737max\/737-max-software-updates.page \">statement<\/a> as to a software fix it is developing to solve the MCAS\/AOA problem.&nbsp; Additionally, an honest question is being asked as to the relationship between the FAA and the Boeing Company.&nbsp; <\/p>\n\n\n\n<figure class=\"wp-block-image is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/doctoraviation.com\/wp-content\/uploads\/2019\/05\/Boeing-1024x239.png\" alt=\"\" class=\"wp-image-4128\" width=\"523\" height=\"122\"\/><\/figure>\n\n\n\n<p>Boeing established an impressive safety record.&nbsp; Top FAA officials have gone back and forth between the private industry and the FAA.&nbsp; Additionally, government deregulation has resulted in delegation of safety inspections to aircraft manufactures.&nbsp; Have all these factors resulted in too cozy a relationship?&nbsp; In other words, was the safety inspection process for a new aircraft compromised.&nbsp; This <a href=\"https:\/\/www.wsj.com\/articles\/timeline-for-returning-boeing-737-max-jets-to-the-skies-lengthens-11557758701\">news story<\/a> in investigates that question.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"alignright\"><img loading=\"lazy\" decoding=\"async\" width=\"220\" height=\"219\" src=\"https:\/\/doctoraviation.com\/wp-content\/uploads\/2019\/05\/FAA-e1558400193377.png\" alt=\"\" class=\"wp-image-4129\"\/><\/figure><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Returning Trust<\/h3>\n\n\n\n<p>In an effort to answer questions and restore the\npublic\u2019s trust the JATR has been commissioned.&nbsp;\nThe Joint Authority Technical Review team is tasked to examine the\ncertification process for the Boeing MCAS.&nbsp;\nThis board is not investigating the accidents, rather they are looking\nat the process, to determine if the process of certifying (the system as safe)\nwas in fact a problem.&nbsp; <\/p>\n\n\n\n<p>The board is made up of representatives from nine civil aviation authorities from around the world.&nbsp; These include the FAA and NASA.&nbsp; The team is chaired by the National Transportation Safety Board Chairman.&nbsp; More details can be found at the<a href=\"https:\/\/www.faa.gov\/news\/updates\/?newsId=93206\"> FAA site<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Where we are Now<\/h3>\n\n\n\n<p>Airlines had hoped to have the 737 Max return to the\nsky for the busy summer travel season.&nbsp;\nHowever, for now the aircraft remain grounded.&nbsp; Reports indicate that August may be the\nsoonest that the aircraft returns to the air.&nbsp;\nThere are technical hurdles to overcome (with the AOA and MCAS), flight\ntests, training and the process review to complete.&nbsp; \n\nHowever, as most of\nus know from personal experience, the longest road may be the one to restore\ntrust.&nbsp; Trust can be broken quickly but\ntakes a long time to build. \n\n\n\n<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"330\" height=\"220\" src=\"https:\/\/doctoraviation.com\/wp-content\/uploads\/2019\/05\/Pilot-Boeing-e1558400207956.jpg\" alt=\"\" class=\"wp-image-4130\"\/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>In March of 2019, the Boeing 737 Max dominated the news headlines.&nbsp; This is the latest on the Boeing 737 Max.&nbsp; Each bullet is designed to give a summary The Plane The Boeing 737 Max is the latest edition of one of Boeing\u2019s most popular airliners.&nbsp; The 737 debuted in 1968.&nbsp; Bolstered by the success [&hellip;]<\/p>\n","protected":false},"author":338,"featured_media":4136,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"footnotes":"","_jetpack_memberships_contains_paid_content":false,"jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false}}},"categories":[24],"tags":[992,374,995,993,994,991,981],"jetpack_publicize_connections":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>The Latest on the Boeing 737 Max - Doctor Aviation<\/title>\n<meta name=\"description\" content=\"In March of 2019, the Boeing 737 Max dominated the news headlines. 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