Editing Airbus A380 (section)

===Systems===
[[File:Airbus A380 Fahrwerk.jpg|thumb|A380 20-wheel main [[landing gear]]]]

[[Fly-by-wire#Power-by-wire|Power-by-wire]] flight control actuators have been used for the first time in civil aviation to back up primary [[hydraulic]] actuators. Also, during certain manoeuvres they augment the primary actuators.<ref>{{Cite journal|title=Advances in more-electric aircraft technologies|journal=Aircraft Engineering and Aerospace Technology|year=2001|volume=73|issue=3|publisher=Emerald Group}}</ref> They have self-contained hydraulic and electrical power supplies. [[Electro-hydrostatic actuator]]s (EHA) are used in the [[aileron]] and [[elevator (aircraft)|elevator]], electric and hydraulic motors to drive the slats as well as electrical backup hydrostatic actuators (EBHA) for the rudder and some spoilers.<ref name="avionics_magazine2">{{Cite news|last=Adams |first=Charlotte|title= A380: 'more electric' aircraft|publisher=Aviation Today|date=1 October 2001|url=http://www.aviationtoday.com/cgi/av/show_mag.cgi?pub=av&mon=1001&file=1001a380.htm|archive-url=https://web.archive.org/web/20060317013602/http://www.aviationtoday.com/cgi/av/show_mag.cgi?pub=av&mon=1001&file=1001a380.htm|archive-date=17 March 2006|access-date=26 September 2006}}</ref>

The A380's 350&nbsp;bar (35&nbsp;MPa or 5,000&nbsp;psi) hydraulic system is a significant difference from the typical 210&nbsp;bar (21&nbsp;MPa or 3,000&nbsp;psi) hydraulics used on most commercial aircraft since the 1940s.<ref>{{Cite news|title=A380 pushes 5000 psi into realm of the common man|first=P.J.|last=Henry|publisher=Hydraulics & Pneumatics|access-date=1 November 2012|url=http://hydraulicspneumatics.com/200/TechZone/HydraulicPumpsM/Article/False/6497/TechZone-HydraulicPumpsM}}</ref><ref name="Highlowpress">{{Cite news|title=High pressure, low weight |publisher=Design News |first=Bruce |last=Wiebusch |date=8 September 2002 |url=http://www.designnews.com/article/65-High_pressure_low_weight.php |url-status=dead |archive-url=https://web.archive.org/web/20100714021856/http://www.designnews.com/article/65-High_pressure_low_weight.php |archive-date=14 July 2010}}</ref> First used in military aircraft, high-pressure hydraulics reduce the weight and size of pipelines, actuators and related components. The 350&nbsp;bar pressure is generated by eight de-clutchable hydraulic pumps.<ref name="Highlowpress"/><ref>{{Cite news|title=Eaton wins hydraulic system contract for A380, $200&nbsp;million potential for U.S. company|publisher=Business Wire|date=10 October 2001|url=http://www.defense-aerospace.com/articles-view/release/3/6918/eaton-hydraulic-power-systems-for-a380-%28oct.-12%29.html}}</ref> The hydraulic lines are typically made from [[titanium]]; the system features both fuel- and air-cooled [[heat exchanger]]s. Self-contained electrically powered hydraulic power packs serve as backups for the primary systems, instead of a secondary hydraulic system, saving weight and reducing maintenance.<ref>{{Cite journal|title=Hydraulic services contract for Airbus A380 wing jigs|journal=Aircraft Engineering and Aerospace Technology |year=2004|volume=76|issue=2|publisher=Emerald Group}}</ref>

The A380 uses four 150&nbsp;[[Kilovolt-ampere|kVA]] variable-frequency electrical generators,<ref>{{Cite news|title=Innovative Variable Frequency Power |publisher=Goodrich |access-date=27 October 2009 |url=http://www.goodrich.com/portal/site/grcom?GUID=19187d816707b110VgnVCM10000068f57eaaRCRD}} {{Dead link|date=June 2016|bot=medic}}{{cbignore|bot=medic}}</ref> eliminating constant-speed drives and improving reliability.<ref>{{Cite news|title=A380: 'More Electric' Aircraft|first=Charlotte|last=Adams|work=Avionics Magazine|date=1 October 2001|url=http://www.aviationtoday.com/av/issue/feature/A380-More-Electric-Aircraft_12874.html|access-date=27 October 2009|archive-date=13 May 2009|archive-url=https://web.archive.org/web/20090513102313/http://www.aviationtoday.com/av/issue/feature/A380-More-Electric-Aircraft_12874.html|url-status=dead}}</ref> The A380 uses aluminium power cables instead of copper for weight reduction. The electrical power system is fully computerised and many [[Relay#Types|contactors]] and breakers have been replaced by solid-state devices for better performance and increased reliability.<ref name="avionics_magazine2"/>

<!--APU-->
The auxiliary power comprises the [[Auxiliary Power Unit]] (APU), the electronic control box (ECB), and mounting hardware. The APU in use on the A380 is the {{cvt|1800|hp|disp=out}} PW 980A APU. The APU primarily provides air to power the Analysis Ground Station (AGS) on the ground and to start the engines. The AGS is a semi-automatic analysis system of flight data that helps to optimise management of maintenance and reduce costs. The APU also powers two 120&nbsp;kVA electric generators that provide auxiliary electric power to the aircraft. There is also a [[ram air turbine]] (RAT) with a 70&nbsp;kVA generator.<ref>{{cite web|work=Hamilton and Sundstrand |title=Airbus A380 Fact sheet |url=http://www.hamiltonsundstrand.com/StaticFiles/HS/Communications/General/Documents/A380%20Fact%20Sheet_June%202011.pdf |access-date=24 April 2016 |url-status=dead |archive-url=https://web.archive.org/web/20130302205101/http://www.hamiltonsundstrand.com/StaticFiles/HS/Communications/General/Documents/A380%20Fact%20Sheet_June%202011.pdf |archive-date=2 March 2013}}</ref>