UBM4D 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. The Space Shuttle had, in addition to its redundant set of four digital computers running its primary flight-control software, a fifth backup computer running a separately developed, reduced-function, software flight-control system - one that could be commanded to take over in the event that a fault ever affected all of the other four computers. The Seminoles rebounded from their loss to Clemson by routing the winless Rice Owls in front of one of the smallest crowds to attend a football game at Doak Campbell Stadium in years. In addition, most of the early digital fly-by-wire aircraft also had an analog electrical, mechanical, or hydraulic back-up flight control system.|Daftar Produk Nokia