{"id":1871,"date":"2025-08-14T10:24:52","date_gmt":"2025-08-14T08:24:52","guid":{"rendered":"https:\/\/acriv.org\/WP\/?page_id=1871"},"modified":"2025-08-14T11:39:44","modified_gmt":"2025-08-14T09:39:44","slug":"%e2%9a%99%ef%b8%8fhorizon-artificiel","status":"publish","type":"page","link":"https:\/\/acriv.org\/WP\/%e2%9a%99%ef%b8%8fhorizon-artificiel\/","title":{"rendered":"\u2699\ufe0fHORIZON ARTIFICIEL"},"content":{"rendered":"<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"243\" height=\"208\" src=\"https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-47.png\" alt=\"\" class=\"wp-image-1879\" style=\"width:230px;height:auto\" srcset=\"https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-47.png 243w, https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-47-123x105.png 123w\" sizes=\"auto, (max-width: 243px) 100vw, 243px\" \/><\/figure>\n<\/div>\n\n\n<p>Un <strong>horizon artificiel<\/strong> (ou <em>attitude indicator<\/em> en anglais) est un instrument de bord utilis\u00e9 en aviation pour indiquer l\u2019<strong>assiette<\/strong> de l\u2019avion, c\u2019est-\u00e0-dire son inclinaison par rapport \u00e0 l\u2019horizon r\u00e9el (inclinaison en tangage et en roulis).<br>C\u2019est particuli\u00e8rement essentiel quand l\u2019horizon naturel est invisible \u2014 par exemple de nuit, dans les nuages ou en vol sans rep\u00e8res visuels.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"314\" height=\"161\" src=\"https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-44.png\" alt=\"\" class=\"wp-image-1874\" style=\"width:443px;height:auto\" srcset=\"https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-44.png 314w, https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-44-300x154.png 300w, https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-44-310x159.png 310w, https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-44-150x77.png 150w\" sizes=\"auto, (max-width: 314px) 100vw, 314px\" \/><\/figure>\n<\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">1. <strong>\u00c0 quoi \u00e7a sert<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Tangage (pitch)<\/strong> : montre si le nez de l\u2019avion est relev\u00e9 ou baiss\u00e9 par rapport \u00e0 l\u2019horizon.<\/li>\n\n\n\n<li><strong>Roulis (bank)<\/strong> : montre l\u2019inclinaison lat\u00e9rale (gauche ou droite).<\/li>\n\n\n\n<li>Permet de voler en ligne droite, monter ou descendre avec pr\u00e9cision, m\u00eame sans voir le sol ou le ciel.<\/li>\n\n\n\n<li>\u00c9vite la <strong>d\u00e9sorientation spatiale<\/strong> du pilote.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"920\" height=\"640\" src=\"https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-42.png\" alt=\"\" class=\"wp-image-1872\" style=\"width:292px;height:auto\" srcset=\"https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-42.png 920w, https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-42-300x209.png 300w, https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-42-768x534.png 768w, https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-42-800x557.png 800w, https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-42-431x300.png 431w, https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-42-310x216.png 310w, https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-42-150x105.png 150w\" sizes=\"auto, (max-width: 920px) 100vw, 920px\" \/><\/figure>\n<\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2. <strong>Comment \u00e7a fonctionne<\/strong><\/h3>\n\n\n\n<p>Il existe deux grandes g\u00e9n\u00e9rations de technologies :<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>a) Horizon artificiel m\u00e9canique (classique)<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>C\u0153ur : un gyroscope<\/strong> mont\u00e9 dans une structure \u00e0 cardans.\n<ul class=\"wp-block-list\">\n<li>Le gyroscope reste stable dans l\u2019espace gr\u00e2ce \u00e0 la conservation de son axe de rotation.<\/li>\n\n\n\n<li>Le cockpit peut bouger autour du gyroscope, et l\u2019instrument traduit ce mouvement en un affichage.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Affichage<\/strong> :\n<ul class=\"wp-block-list\">\n<li>Une partie fixe (souvent bleue en haut = ciel, brune en bas = sol).<\/li>\n\n\n\n<li>Un rep\u00e8re avion (petit symbole) qui reste fixe au centre.<\/li>\n\n\n\n<li>Lorsque l\u2019avion s\u2019incline ou pique, la ligne d\u2019horizon bouge sur le cadran.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Alimentation<\/strong> : souvent pneumatique (air comprim\u00e9 entra\u00eenant le rotor) ou \u00e9lectrique.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"546\" height=\"312\" src=\"https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-43.png\" alt=\"\" class=\"wp-image-1873\" style=\"width:325px;height:auto\" srcset=\"https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-43.png 546w, https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-43-300x171.png 300w, https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-43-525x300.png 525w, https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-43-310x177.png 310w, https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-43-150x86.png 150w\" sizes=\"auto, (max-width: 546px) 100vw, 546px\" \/><\/figure>\n<\/div>\n\n\n<h4 class=\"wp-block-heading\"><strong>b) Horizon artificiel \u00e9lectronique (EFIS \/ PFD)<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Utilise des <strong>centrales \u00e0 inertie<\/strong> (IMU) avec gyrom\u00e8tres et acc\u00e9l\u00e9rom\u00e8tres, parfois combin\u00e9s au GPS.<\/li>\n\n\n\n<li>Calcul num\u00e9rique de l\u2019attitude.<\/li>\n\n\n\n<li>Affichage sur un \u00e9cran (souvent LCD) avec graphismes dynamiques.<\/li>\n\n\n\n<li>Plus pr\u00e9cis et moins sensible aux erreurs m\u00e9caniques, mais d\u00e9pend de l\u2019alimentation \u00e9lectrique.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"846\" height=\"682\" src=\"https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-45.png\" alt=\"\" class=\"wp-image-1875\" style=\"width:310px;height:auto\" srcset=\"https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-45.png 846w, https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-45-300x242.png 300w, https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-45-768x619.png 768w, https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-45-800x645.png 800w, https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-45-372x300.png 372w, https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-45-310x250.png 310w, https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-45-130x105.png 130w\" sizes=\"auto, (max-width: 846px) 100vw, 846px\" \/><\/figure>\n<\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">3. <strong>Limites et pr\u00e9cautions<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Les mod\u00e8les m\u00e9caniques peuvent <strong>pr\u00e9cesser<\/strong> (d\u00e9river) et n\u00e9cessitent un recalage p\u00e9riodique.<\/li>\n\n\n\n<li>Ils peuvent \u00eatre perturb\u00e9s en cas de fortes acc\u00e9l\u00e9rations non gravitationnelles.<\/li>\n\n\n\n<li>Une panne d\u2019alimentation ou de gyroscope peut rendre l\u2019indication fausse \u2192 d\u2019o\u00f9 la pr\u00e9sence d\u2019instruments de secours.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\ud83d\udca1 <strong>En r\u00e9sum\u00e9<\/strong> :<br>L\u2019horizon artificiel est comme un \u00ab niveau \u00e0 bulle sophistiqu\u00e9 \u00bb qui, gr\u00e2ce \u00e0 un gyroscope ou des capteurs inertiels, montre \u00e0 un pilote comment son avion est orient\u00e9 par rapport \u00e0 l\u2019horizon, m\u00eame quand cet horizon n\u2019est pas visible.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Un horizon artificiel (ou attitude indicator en anglais) est un instrument de bord utilis\u00e9 en aviation pour indiquer l\u2019assiette de l\u2019avion, c\u2019est-\u00e0-dire son inclinaison par rapport \u00e0 l\u2019horizon r\u00e9el (inclinaison en tangage et en roulis).C\u2019est particuli\u00e8rement essentiel quand l\u2019horizon naturel est invisible \u2014 par exemple de nuit, dans les nuages ou en vol sans rep\u00e8res visuels. 1. \u00c0 quoi \u00e7a<\/p>\n<p><a class=\"more-link\" href=\"https:\/\/acriv.org\/WP\/%e2%9a%99%ef%b8%8fhorizon-artificiel\/\">Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-1871","page","type-page","status-publish","hentry"],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/acriv.org\/WP\/wp-json\/wp\/v2\/pages\/1871","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/acriv.org\/WP\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/acriv.org\/WP\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/acriv.org\/WP\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/acriv.org\/WP\/wp-json\/wp\/v2\/comments?post=1871"}],"version-history":[{"count":3,"href":"https:\/\/acriv.org\/WP\/wp-json\/wp\/v2\/pages\/1871\/revisions"}],"predecessor-version":[{"id":1929,"href":"https:\/\/acriv.org\/WP\/wp-json\/wp\/v2\/pages\/1871\/revisions\/1929"}],"wp:attachment":[{"href":"https:\/\/acriv.org\/WP\/wp-json\/wp\/v2\/media?parent=1871"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}