Editing Fly-by-wire (section)

== Analog systems ==
All fly-by-wire flight control systems eliminate the complexity, fragility and weight of the mechanical circuit of the hydromechanical or electromechanical flight control systems – each being replaced with electronic circuits. The control mechanisms in the cockpit now operate signal transducers, which in turn generate the appropriate commands. These are next processed by an electronic controller—either an [[analogue electronics|analog]] one, or (more modernly) a [[digital electronics|digital]] one. Aircraft and spacecraft [[autopilot]]s are now part of the electronic controller.{{Citation needed|date=May 2010}}

The hydraulic circuits are similar except that mechanical servo valves are replaced with electrically controlled servo valves, operated by the electronic controller. This is the simplest and earliest configuration of an analog fly-by-wire flight control system. In this configuration, the flight control systems must simulate "feel". The electronic controller controls electrical devices that provide the appropriate "feel" forces on the manual controls. This was used in [[Concorde]], the first production fly-by-wire airliner.{{efn|The Tay-Viscount was the first airliner to be fitted with electrical controls<ref>{{Cite web|url=http://www.flightglobal.com/pdfarchive/view/1986/1986%20-%200838.html|title=Dowty wins vectored thrust contract |work=Flight International |date=5 April 1986 |page=40  |archive-url=https://web.archive.org/web/20181121184945/https://www.flightglobal.com/pdfarchive/view/1986/1986%20-%200838.html |archive-date=21 November 2018}}</ref>}}