> In any large airliner the pilot's controls are indirectly linked to the flight surfaces by either hydraulic or electrical systems. I understand the 777 and 7

> In any large airliner the pilot's controls are indirectly linked to the flight surfaces by either hydraulic or electrical systems. I understand the 777 and 787 are special cases, but my impression of the rest of their line was that the flight controls are directly linked by control cables and are assisted by mechanical-hydraulic servos, a bit like hydraulic power steering on cars. So with a total loss of electrical systems they would still have normal primary flight controls. Of hydraulic servos can fail (for example the aforementioned 737) and even triple hydraulic systems can be taken out by something like the uncontained engine failure of United Airlines Flight 232. I tend to think that electrical and electronic systems can ultimately be more reliable and maintainable, but I worry that the safety culture is much worse among the designers of such systems than their mechanical equivalents (no wonder, we've been tinkering with the latter for thousands of years and the former only a few decades).