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Thread: CABLE vs FBW
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Old 5th February 2009 | 18:20
  #23 (permalink)  
Cyclone733
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Joined: Aug 2003
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Given the choice between cables and pullies or electronically signalled flight controls I'd take the latter.

Cables can fall off pullies and be easily jammed by loose objects.

Fly by wire or fly by light can seem to be an over complication, but in the case of civil aircraft the number of backup systems and modes covers the majority of eventualities.

Both control types on modern aircraft tend to have an artificial feel unit for powered control surfaces, so there is no improvement in the pilots feedback from the controls in the case of cables. In the case of more modern cable controlled powered control surfaces the cable only operates the hydraulic servos and offers no manual control of the surface in the event of a total hydraulics failure. Although there is often an electric trim tab

Of more interest to me is the processing of control inputs between the flght deck and the controls. The FBW systems can account for a higher number of variables than an arrangement of pulleys. This will hopefully lead to damage tollerant aircraft which can adapt to damage or failure of flight control systems. It also allows for a greater intigration of the automatics into the aircraft.
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