{"id":2325683,"date":"2026-06-19T17:44:35","date_gmt":"2026-06-19T15:44:35","guid":{"rendered":"https:\/\/migflug.com\/jetflights\/aircraft-apu-auxiliary-power-unit-explained\/"},"modified":"2026-07-21T13:50:07","modified_gmt":"2026-07-21T11:50:07","slug":"spiegazione-dellunita-di-potenza-ausiliaria-apu-dellaeromobile","status":"publish","type":"post","link":"https:\/\/migflug.com\/afterburner\/it\/aircraft-apu-auxiliary-power-unit-explained\/","title":{"rendered":"Il motore nascosto nella coda del tuo aereo di linea"},"content":{"rendered":"<p><style>.et_pb_title_container h1.entry-title { padding-top: 40px !important; }<\/style><\/p>\r\n<p>You step onto a parked airliner and everything just works. The cabin lights are on, the air is cool, screens are glowing \u2014 and yet the two great engines on the wings are stone-cold silent. Somewhere behind you, a faint high-pitched whine is the only clue to what is actually keeping the aircraft alive. It is a third jet engine, one you almost never see, tucked right in the tip of the tail.<\/p>\r\n<p>It is called the Auxiliary Power Unit, and it is one of the unsung heroes of modern flight.<\/p>\r\n\r\n<div style=\"background: #f4f6f9; border: 1px solid #e2e8f0; border-radius: 8px; padding: 18px 22px; margin: 24px 0; font-size: 15px; line-height: 1.7;\">\r\n<p style=\"margin: 0 0 8px; font-weight: bold; color: #1565c0;\">Quick Facts<\/p>\r\n<ul style=\"margin: 0; padding-left: 18px;\">\r\n<li><strong>What:<\/strong> the Auxiliary Power Unit (APU) \u2014 a small gas-turbine engine, usually in the tailcone<\/li>\r\n<li><strong>On the ground:<\/strong> it supplies electricity and air conditioning while the main engines are off<\/li>\r\n<li><strong>Its key job:<\/strong> providing the high-pressure air that spins up (\u201ccranks\u201d) the main engines for starting<\/li>\r\n<li><strong>Runs on:<\/strong> the same jet fuel as the engines, drawn from the aircraft\u2019s tanks<\/li>\r\n<li><strong>In the air:<\/strong> it acts as backup electrical power and can help restart an engine if needed<\/li>\r\n<\/ul>\r\n<\/div>\r\n\r\n<h2 style=\"padding-top: 22px;\">A Jet Engine for the Jet Engines<\/h2>\r\n<p>The APU is a small gas-turbine engine \u2014 essentially a miniature jet \u2014 usually housed in the very back of the fuselage, behind a small exhaust opening at the tailcone. Unlike the main engines, it isn\u2019t there to produce thrust. Started by the aircraft\u2019s battery and burning the same jet fuel from the wing tanks, it spins up a generator to make electricity and a compressor to make pressurised air.<\/p>\r\n<h2 style=\"padding-top: 22px;\">What It Actually Does<\/h2>\r\n<p>On the ground, the APU makes the aircraft self-sufficient. It runs the lights, the avionics and the air conditioning at the gate without the plane having to be plugged into ground power carts. But its single most important trick comes at start-up: those huge main engines cannot spin themselves up to ignition speed on their own. The APU supplies the blast of high-pressure air that turns the engine cores until they are spinning fast enough to light. Without an APU (or a ground air-start cart standing in for it), a big jet simply cannot start its engines.<\/p>\r\n\r\n<figure class=\"wp-block-image size-large\" style=\"margin: 0 0 24px;\"><img data-opt-id=1236619484  fetchpriority=\"high\" decoding=\"async\" class=\"skip-lazy\" style=\"display: block; width: 100%!important; max-width: 100%!important; height: auto!important; border-radius: 6px;\" 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\/06\/apu-for-a320-family.jpg\" alt=\"An APU for the Airbus A320 family\" data-no-lazy=\"1\" \/>\r\n<figcaption style=\"font-size: 13px; color: #777; text-align: center; margin-top: 6px; font-style: italic;\">Compact enough to fit in a tailcone, yet powerful enough to crank a jet engine to life. (Photo: Wikimedia Commons)<\/figcaption>\r\n<\/figure>\r\n\r\n<h2 style=\"padding-top: 22px;\">And in the Air<\/h2>\r\n<p>Once the main engines are running and generating their own power, the APU has done its job and is usually switched off to save fuel. But it is far from forgotten. It is a critical backup: if a main generator fails in flight, the APU can take over the electrical load, and on long over-water flights it is part of the safety case that lets a twin-engine jet keep flying \u2014 ready to restart an engine and keep the cabin powered if something goes wrong.<\/p>\r\n<p>So next time you board and hear that whine from the back, give a small nod to the little engine doing all the work while the big ones rest.<\/p>\r\n\r\n<div style=\"display: flex; justify-content: center; margin: 2em 0;\">\r\n<blockquote class=\"instagram-media\" style=\"background: #FFF; border: 0; border-radius: 3px; box-shadow: 0 0 1px 0 rgba(0,0,0,0.5),0 1px 10px 0 rgba(0,0,0,0.15); margin: 1px; max-width: 540px; min-width: 326px; padding: 0; width: 99%;\" data-instgrm-permalink=\"https:\/\/www.instagram.com\/reel\/DWi1wnNjH3-\/\" data-instgrm-version=\"14\"><a href=\"https:\/\/www.instagram.com\/reel\/DWi1wnNjH3-\/\" target=\"_blank\" rel=\"noopener\">View this post on Instagram<\/a><\/blockquote>\r\n<script async src=\"\/\/www.instagram.com\/embed.js\"><\/script><\/div>\r\n\r\n<p style=\"font-size: 13px; color: #777; font-style: italic;\">Sources: aircraft manufacturer and operator technical material; aviation engineering references.<\/p>\r\n<!-- mf-faq -->\r\n\r\n\r\n<div class=\"mf-faq-block\"><style>.mf-faq-block{margin:34px 0}.mf-faq-item:not([open]) .mf-faq-answer{display:none !important}.mf-faq-block h2.mf-faq-h{padding-top:22px;margin-bottom:14px}.mf-faq-item{border:1px solid #e2e8f5;border-radius:8px;margin:0 0 10px;background:#fff}.mf-faq-item summary{list-style:none;cursor:pointer;padding:15px 50px 15px 18px;font-weight:600;color:#1a1a1a;position:relative;line-height:1.45;user-select:none}.mf-faq-item summary::-webkit-details-marker{display:none}.mf-faq-item summary::after{content:\"+\";position:absolute;right:18px;top:50%;transform:translateY(-50%);font-size:1.5em;font-weight:400;color:#5C91FF;line-height:1}.mf-faq-item[open] summary::after{content:\"\\2013\"}.mf-faq-item[open] summary{border-bottom:1px solid #eef1f8}.mf-faq-item summary:hover{background:#f5f8ff}.mf-faq-answer{padding:14px 18px;color:#333;line-height:1.6}.mf-faq-answer p{margin:0}.mf-faq-answer a{color:#5C91FF}<\/style>\r\n<h2 class=\"mf-faq-h\">Related Questions<\/h2>\r\n<details class=\"mf-faq-item\">\r\n<summary>What is an APU on an aircraft?<\/summary>\r\n<div class=\"mf-faq-answer\">\r\n<p>An APU, or auxiliary power unit, is a small gas-turbine engine usually housed in the tailcone of an aircraft. It is effectively a jet engine for the jet engines: it supplies electrical power and air without needing the main engines running, making the aircraft self-sufficient on the ground.<\/p>\r\n<\/div>\r\n<\/details><details class=\"mf-faq-item\">\r\n<summary>What does an aircraft APU do?<\/summary>\r\n<div class=\"mf-faq-answer\">\r\n<p>On the ground the APU provides electricity and air conditioning while the main engines are off, and crucially it supplies the high-pressure air that spins up \u2014 or cranks \u2014 the main engines for starting. In flight it serves as backup electrical power and can help restart an engine if needed.<\/p>\r\n<\/div>\r\n<\/details><details class=\"mf-faq-item\">\r\n<summary>Where is the APU located on a plane?<\/summary>\r\n<div class=\"mf-faq-answer\">\r\n<p>On most airliners the APU sits in the tailcone, at the very rear of the fuselage, which is why many jets have a small exhaust outlet at the tail. Placing it there keeps it clear of the cabin and main engines while feeding power throughout the aircraft.<\/p>\r\n<\/div>\r\n<\/details><details class=\"mf-faq-item\">\r\n<summary>What fuel does an APU use?<\/summary>\r\n<div class=\"mf-faq-answer\">\r\n<p>The APU runs on the same jet fuel as the main engines, drawn from the aircraft's own tanks. This means crews don't need a separate fuel supply, and the unit can operate whenever there is fuel aboard, on the ground or in the air.<\/p>\r\n<\/div>\r\n<\/details><details class=\"mf-faq-item\">\r\n<summary>How does a jet engine get started?<\/summary>\r\n<div class=\"mf-faq-answer\">\r\n<p>A jet engine needs something to spin its compressor before it can run. The APU provides the high-pressure bleed air that cranks the main engines up to starting speed. The same logic of redundancy matters when things go wrong \u2014 see <a href=\"https:\/\/migflug.com\/afterburner\/what-happens-fighter-jet-engine-failure-flameout\/\">what happens when a jet engine fails<\/a>.<\/p>\r\n<\/div>\r\n<\/details><details class=\"mf-faq-item\">\r\n<summary>Does the APU work during flight?<\/summary>\r\n<div class=\"mf-faq-answer\">\r\n<p>Yes. Although its main job is on the ground, the APU can run in flight as a backup source of electrical power and bleed air. If a main engine fails or generators are lost, the APU can supply power and help restart an engine, adding an important layer of safety.<\/p>\r\n<\/div>\r\n<\/details><details class=\"mf-faq-item\">\r\n<summary>Why do all modern airliners carry an APU?<\/summary>\r\n<div class=\"mf-faq-answer\">\r\n<p>Nearly every <a href=\"https:\/\/migflug.com\/afterburner\/why-every-modern-airliner-looks-the-same\/\">modern airliner<\/a> uses an APU because it makes the aircraft independent of ground equipment: it powers cabin systems at the gate, starts the engines, and provides emergency backup aloft. That versatility is why the tailcone turbine has become standard across the industry.<\/p>\r\n<\/div>\r\n<\/details><\/div>\r\n<p><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What is an APU on an aircraft?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"An APU, or auxiliary power unit, is a small gas-turbine engine usually housed in the tailcone of an aircraft. It is effectively a jet engine for the jet engines: it supplies electrical power and air without needing the main engines running, making the aircraft self-sufficient on the ground.\"}},{\"@type\":\"Question\",\"name\":\"What does an aircraft APU do?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"On the ground the APU provides electricity and air conditioning while the main engines are off, and crucially it supplies the high-pressure air that spins up \u2014 or cranks \u2014 the main engines for starting. 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That versatility is why the tailcone turbine has become standard across the industry.\"}}]}<\/script><!-- \/mf-faq -->\r\n\r\n\r\n<div style=\"background: #f0f4ff; border-left: 4px solid #5C91FF; padding: 16px 20px; margin: 32px 0 8px; border-radius: 0 8px 8px 0;\">\r\n<p style=\"margin: 0 0 8px; font-weight: 600; color: #333;\">Related Posts<\/p>\r\n<p style=\"margin: 4px 0;\"><a href=\"https:\/\/migflug.com\/afterburner\/how-aerial-refueling-actually-works-boom-vs-probe-and-drogue-at-500-mph\/\">How Aerial Refueling Actually Works<\/a><\/p>\r\n<p style=\"margin: 4px 0;\"><a href=\"https:\/\/migflug.com\/afterburner\/why-every-modern-airliner-looks-the-same\/\">Why Every Modern Airliner Looks the Same<\/a><\/p>\r\n<\/div>\r\n","protected":false},"excerpt":{"rendered":"<p>You step onto a parked airliner and everything just works. The cabin lights are on, the air is cool, screens are glowing \u2014 and yet the two great engines on the wings are stone-cold silent. Somewhere behind you, a faint high-pitched whine is the only clue to what is actually keeping the aircraft alive. It [&hellip;]<\/p>\n","protected":false},"author":27,"featured_media":2325670,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"editor_notices":[],"footnotes":""},"categories":[665],"tags":[],"class_list":["post-2325683","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aviation-world"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Auxiliary Power Unit: The Hidden Engine in the Tail<\/title>\n<meta name=\"description\" content=\"The Auxiliary Power Unit is the small turbine in an airliner&#039;s tail that keeps lights, air and screens alive before the engines ever start.\" \/>\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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