Editing Fly-by-wire (section)

=== Efficiency of flight ===
For airliners, flight-control redundancy improves their safety, but fly-by-wire control systems, which are physically lighter and have lower maintenance demands than conventional controls also improve economy, both in terms of cost of ownership and for in-flight economy. In certain designs with limited relaxed stability in the pitch axis, for example the Boeing 777, the flight control system may allow the aircraft to fly at a more aerodynamically efficient angle of attack than a conventionally stable design. Modern airliners also commonly feature computerized Full-Authority Digital Engine Control systems ([[FADEC]]s) that control their engines, air inlets, fuel storage and distribution system, in a similar fashion to the way that FBW controls the flight control surfaces. This allows the engine output to be continually varied for the most efficient usage possible.<ref>{{Cite web|date=29 June 2001|title=Full Authority Digital Engine Control|url=https://www.faa.gov/documentLibrary/media/Advisory_Circular/AC_33.28-1.pdf|access-date=3 January 2022|work=Compliance Criteria For 14 CFR §33.28, Aircraft Engines, Electrical And Electronic Engine Control Systems|author=Federal Aviation Administration|author-link=Federal Aviation Administration|archive-url= https://web.archive.org/web/20200624041757/https://www.faa.gov/documentLibrary/media/Advisory_Circular/AC_33.28-1.pdf|archive-date= 24 June 2020|url-status= live}}</ref>

The [[Embraer E-Jet E2 family|second generation Embraer E-Jet family]] gained a 1.5% efficiency improvement over the first generation from the fly-by-wire system, which enabled a reduction from 280&nbsp;ft.² to 250&nbsp;ft.² for the [[horizontal stabilizer]] on the E190/195 variants.<ref name="AWSTEmbraerE2CertificationTestsSetToAccelerate">{{cite news|last1=Norris|first1=Guy|title=Embraer E2 Certification Tests Set to Accelerate|url=http://aviationweek.com/commercial-aviation/embraer-e2-certification-tests-set-accelerate|access-date=6 September 2016|work=[[Aviation Week & Space Technology]]|publisher=[[Aviation Week]]|date=5 September 2016|url-access=registration }}</ref>